can someone help me on how to become a builder?

Ranks don't work like that on this server

The ranks are

Guest

Member

Donator

Helper

Mod

Admin

Owner

I think yo mean member

Just apply here

www.minetown.net/join

And wait for it to be accepted

If you need any more help just ask...

Also, while waiting on your application approval, you can play in the guest world and go ahead and get a jumpstart on acquiring resources for when you become a member. The application process can take up to 48 hours!

Good luck and Happy Mining!