Help:VBulletin:Dealing with Troublesome Users
Can I block posts, emails and messages from specific users?
If there are particular members that bother you and you do not want to see their posts or receive Private Messages and Emails from them, then you can add these members to your 'Ignore List'. There are several ways to do this:
Through your User Control Panel: User CP, Settings & Options, Edit Ignore List. Then, click on their name and choose: User List, Add to Ignore List
What if I see something offensive?
You will find 'Report' links in many places throughout the board. These links allow you to alert the board staff to anything which you find to be offensive, objectionable or illegal.