Functionality of Bookmark Feature

Please forgive me, but I don’t know how I to get back to a thread I previously bookmarked. Any tips?

Once you bookmarked a thread, you can click you avatar in the upper right corner, and choose the 2nd tab that is Bookmarks.
Or save this shortcut: https://boards.straightdope.com/bookmarks

While I am at it some other handy shortcuts:
https://boards.straightdope.com/posted Shows the most recent threads you posted in.
https://boards.straightdope.com/tags Shows all the tags for easy sorting of Café subjects.

This one is trickier: https://boards.straightdope.com/u/username/activity/topics
Replace username with your username for threads you started.

Do you remember what the thread was called? You could look for that.

Ah, very good. Thank you!