Tagging titles and creating new tags
To tag a title
Tap Tag on a title's details screen or in a list, then select a tag.

You can also tag loans and holds on your Shelf
and anything on your Timeline .To create a new tag
- Tap Tag on a title's details screen or in a list.
- Tap New Tag.
- Name your new tag.
- (Optional) Add a description and some smarts (like "Notify Me").
- Tap Done to close the panel.