How do i change the word 'Forum'

[RobbieZ]

I hope ive posted this in the correct section..

Ok, when you first go to your forum. you have your header at the top.. then next down on the right you can see Welcome. so n so.. last visited & private messages..

Now on the left there is a word or word that either say 'Forum's' or 'vbulletin community forum'

How do you change that word or line of text to something else.. the name of my site..

Thanks in advance..