2.3.0 upgrade

Hi, I just renewed for this domain for 2.3.0. I am trying to update the forums but getting permissions errors for resource manager. What would be the best way to resolve this. Is there a table which I can consult to check file permissions. Its been 5-6 years since I logged into this forum...

Hello friends. Today I upgraded the forum from 2.1.6 to 2.3.0, but all of my pictures and avatars in the forum are not visible. I am waiting for your help on this issue. By the way, I still have my old FTP backup.