What you will need to do is get with the owner of the license and have them add you to their account...they will be able to add up to 3 users to their account to allow them to show up here as a licensed user.
I am almost certain it would be a violation of our policies for someone to send code via PM written by someone else here, particularly if that code was released as a vB product.
Also, that modification is in the graveyard. However, I have published something similar for vB 4.2.x that can be found here:
BBCode For Username HTML Markup [v1.2.1]
I would still ask that you go through the process of showing up as a licensed user, as I would rather stick to the site policy of licensed users only obtaining products here.