So I have a mybb forum installed on / and I want to move it to /forums. Can I just move it to a /forums directory without messing anything up?
Please search, their are hundreds of these threads already. I believe someone asked this question 2 days ago so their must be a fresh thread in the support forums on this topic.
^ What he said.
Anyway, you need to go to ACP > Configuration > General Configuration > and edit the Board URL and cookie domain to reflect the new URL.