Click on the star at the right of the address bar to bring up the attached screen. You can change the name, pick a folder, and tags.

Hi offingarias, in the screenshot shared by OBW47, you'll notice there is a checkbox near the bottom of the Add/Edit Bookmark panel to "Show editor when saving". You can check that box if you want the panel to drop down automatically when you are saving a new bookmark.

If you are normally changing to the same folder over and over, you can use an add-on to set that other folder as the default folder for new bookmarks:

https://addons.mozilla.org/firefox/addon/default-bookmark-folder/

Is this for mobile iOS? I don’t see these options.

That is for Mac, sorry. The design on iOS is highly simplified compared with desktop systems.

How to add, remove, edit and move bookmarks in Firefox for iOS