How do I change someone's password using Data Manager?
 

How may I change someone's password using vBulletin Data Manager and by looking up the person's info by email only?

[EDIT]
I am using PHP for this...

You need to get the ID to use the data manager. You can do this by querying for the email, and getting the ID. This will have issues if you allow multiple users to share an email address.

Thanks Dismounted, in the vb data manager, how would I query in for the email? I have tried looking in the documentation and google, but having trouble figuring it out. If you can direct me somewhere it would be much appreciated. :)

You can't do that inside a data manager. The data manager needs the ID to update any existing records. You need to run your own query to fetch the ID beforehand.