MyBB Community Forums

after install google seo plugins
i find many 404 (not found) in my forum ziuma.com
how to fix this problem
or how to redirect 404 to portal.php

thank you

Which plugin did you install? The one called Google SEO has 301 redirects in place, so you should not have 404 errors after installing.

404 errors are the correct response if those threads have been deleted.