I installed vBSEO on my forum and now i get "page can not be found" on all sections of my forum. Where do i change/update this so i get it to work properly again?
Check what Thomas U has mentioned. VBSEO comes with a .htaccess file. Also you can use VBSEO's support ticket system to get support from there staff if it's not the .htaccess file. Just visit there site.