In the most of the forums there is the option to hide text links or photos from guests.
They do it to force guests to become mebers.
Is there this option in wpforo?
Hide links passes
I'm sorry, but there is no such feature.
Hide photos from guets
Please edit the No Access (if it's specific forum access for Guests Usergroup) n Dashboard > Forums > Settings > Forum Accesses admin page, uncheck the "Can view attached files" checkbox.