What is a tag?
A tag is a keyword — a relative of the category and the label. A tag can be a person, a place, an event, or virtually anything you can dream up. Broad examples would be 'sunset,' 'wedding,' or 'james.' 
A single item can have many tags — say, a photo of James at a wedding at sunset. In the iLovePhotos universe, a tag is most often a person. Or rather, a person's name. At its most powerful, a tag is linked to a lot more information, such as the person's contact information.
Since iLovePhotos can be fully integrated with your Address Book, adding this information to a tag is a snap.
Creating tags
To create a new tag in the "Photos" view, drag any photo into an empty box in the Tagging Pane on the right side of the screen. To create a new tag in the "Tagger" view, you need only click on a face and then click on an empty box in the Tagging Pane. You will be prompted to enter information about that tag. Once the new tag is created, you can drag all the other photos or click all the other faces that should have that tag to the same box in the Tagging Pane.
For example, you could drag a photo of James into an empty box in the Tagging Pane, then enter James' contact information. Then you can drag all other photos of James onto that same box. Hold down the Command (Apple) key to select more than one photo at a time.
Click or drag?
When in the "Photos" view, photos are tagged by dragging them to a slot in the Tagging Pane. When in the "Tagger" view, you need only click on the face, then click on a slot in the Tagging Pane.
Editing tags
To edit the details of a tag, select the tag and select "Get Tag Info" from the Tags menu (or hit Command-I). You can also right- or option-click the tag to select "Get Tag Info" from the contextual menu.
Step through!
When in the "Get Tag Info" dialog, you can move to the previous or next tag to edit the details for other tags by clicking "Prev" or "Next" in the lower left.
Tagging faces
The 'Tagger' view is designed to make tagging people in your photos as simple as possible. Turn the big red switch to "Tagger," and only the untagged faces in your photos are shown. By separating the faces from the photos, you can focus on tagging. Click on the faces and tag them by clicking on a tag in the Tagging Pane. Hold down the Command (Apple) key as you click on faces to select more than one at a time.
Tagging photos
To tag photos from the 'Photos' view, click on the photos and then tag them by dragging them onto a tag slot in the Tagging Pane. This is especially useful if you've created a tag for an event or for anything else. Lisa's wedding? Bad hair? The sky's the limit. Hold down the Command (Apple) key to select more than one photo at a time.
Creating or deleting tag boxes
If there are any faces that weren't detected, you can quickly add tag boxes by double clicking on a photo and clicking on the missed faces. You can also select and delete tag boxes if there are areas or objects that are misidentified as faces. Spotting and deleting misidentified faces is easiest in the "Tagger" view — you can quickly select and delete anything that is not a face.
Deleting an item in the 'Tagger' view does not delete the photo.
Step through!
When reviewing, adding, or removing tag boxes in the zoomed, single image view, you can click the left or right arrows to step through your photos one at a time, marking faces as you go along.
Tag groups
You can organize your tags into groups. For example, 'Family,' or 'Clients.' You can assign groups to your tags using the "groups" field in the new tag pop-up. Tag groups make it easy to filter your list of tags by specific groups, and to share your photos with a group of people.
Create new groups
When you create a tag, type in the new group name into the group field and press the enter key. Your new group name will become blue. Now when you create other tags, and start typing a group name, it will suggest existing groups that match.
Edit/Delete existing groups
To edit or delete existing groups, select the "Tag Groups..." item from the "Tags" menu. Delete a group by clicking the minus ('-') sign below the group list. Edit a group by double clicking the group name.
Step through!
When in the "Get Tag Info" dialog, you can move to the previous or next tag to assign groups to other tags by clicking "Prev" or "Next" in the lower left.
Sorting and filtering tags
You can quickly navigate through and find tags in different ways. Above the Tag Pane are several tools you can use. Typing in the search box will allow you to quickly find specific tags. The pull-down menu below will allow you to view tags by group. The two thumbnail buttons allow you to toggle the display of tag names on or off. And the gear icon allows you to change the size of tag icons and set the sort order to alphabetical by name, or by popularity (i.e. the number of photos with each tag).
Changing tag icons
To change the icon that represents a tag in the Tagging Pane, select the tag and select "Get Tag Info" from the Tags menu (or hit Command-I). You can also right- or option-click the tag to select "Get Tag Info" from the contextual menu. In the Tag Info dialog box, the tag boxes from various photos are displayed. Click on the image that you want to represent the tag.
When in the "Get Tag Info" dialog, you can move to the previous or next tag to change the tag icon for other tags by clicking "Prev" or "Next" in the lower left.
