On the iPad or iPhone -
up on the toolbar, there’s a square box with an arrow on it. It will give you options to bookmark, copy, print, etc.
To access those bookmarks, reading list, history there’s an icon that looks like an open book.
Learned something new today, I never noticed those little icons !
Also found the other icon also copies threads too. Either way, Bookmarking using the “flag” keeps the thread here on the Armory Site rather than loading into IPad storage.