Ok, go to your admin panel. Then go to styles & templates. Click on Style Manager out of your choices.
Then when you get there click on the drop down menu to your right where it says "All style choices" Choose Edit Templates. Then once you get there edit the header file. Add the top of your site stuff there. For example, put this at the top of your header file
<table>
<tr>
<td>stuff here</td>
</tr>
<tr>
<td>
Then go to your footer file. At the very bottom of your file add the bottom of your site.
for example
more stuff here </td>
</tr>
</table>
If you want to remove the vbulletin logo just pull this code out of your header file.
<a href="$vboptions[forumhome].php$session[sessionurl_q]"><img src="$stylevar[titleimage]" border="0" alt="$vboptions[bbtitle]" /></a>
Then all you have to do is change the background color to match yours in css and play around with the other colors to get it how you like it. I hope this all made sense.