Meta description not correct for vbulletin 4.2.2
 

I have installed vbulletin 4.2.2 on http://sqlteachers.com. When check the number of pages indexed in vbulletin. i see this message in the description.

This is a discussion forum powered by vBulletin. To find out about vBulletin, go to http://www.vbulletin.com/

How can i remove this. Please help me :)