MyBB Community Forums

Hello I'm trying to integrate a rotating php image script, I need to change the default avatar link from .png to .php and I can't find this in the code, could you point me to the correct area or a different approach.

MyBB 1.8
virtueforums.com/index.php

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I'm thinking I could do an if usergroupID="x" Default avatar link = domain.com/image.php

The default avatar image can be set in ACP -> Configuration -> Profile Options