There's no Tags Manager (I've added this suggestion to the future features) but you can use Keywords and Tag Words to mark Bookmark records, like so:
1. Open the extra details of a Bookmark record.

2. Enter some tag words in the Reference and/or the Keywords edit fields.

When you're ready to search, use the Full Search.
- Click the Tools icon.
- Select [Search]

- Enter something to search for.
- Press Begin.

Full Search does require your database to be indexed.
See help: https://bitespire.com/help?Full%20Search%20and%20Indexing.html
Other options for listing specific records can be the use of the very powerful Reports section.
See help: https://bitespire.com/help?Introduction%20to%20Reports.html
I hope this helps you further in your data storage retrieval methods.