The “powered by vBulletin” in the title of a newly installed vB forum is nothing short of annoying. It hurts your SEO value and it looks ugly.
Fixing it isn’t too complicated however.
On the left hand navigation, expand the Language & Phrases menu, then click on Search in Phrases.
In the Search for Text box enter: x_powered_by_vbulletin
Change Search In to Phrase Text and Phrase Variable Name
Click on the edit button to edit the {1} – Powered by vBulletin phrase. Leave the {1} and you’re set. If you have any translations you may want to do it for them as well, instead of just the standard phrase.
That’s it!