[Please Help]How to Customize Vbulletin Header and Footer

Hello pals, Please I'm just starting up the forum section of my Webhosting company and I decided to use vBulletin.
Please help. I want to integrate my site header and footer into vb so that I will have a custom header and footer of my main site.I have seen some other web hosting companies/website do this but not have an idea how to do it.How do I achieve this?
Please share your ideas...
Thanks in advance

You must edit Header and Footer template, also adding some additional CSS. For detailed just find out in the vB forum like vbulletin.org!