Hi there,
I can mark users in Comments or Post but how?
I am bit lost here actually. Did you meant you want to mark users comment/post as resolved? If yes, you have to make sure you have enable "Select Reply As Answer" under
backend>Components>EasyDiscuss>ACL>*User types>Posts and Post Status as shown
http://prntscr.com/chctyo and
http://prntscr.com/chct94, but yo have to make sure under categories you have given permissions for "Moderation" for your user groups at
Backend>Components>EasyDiscuss>Categories>*Types of Categories>Permissions as shown
http://prntscr.com/chcufl.
If not can you elaborate more on your question? And maybe you can provide us with you FTP and Backend access for further check.