Catching up with the Forum

I signed on as the administrator of the MyDietSolutions forum last June.

I had busied myself improving content and learning vBulletin at first, but now I need to upgrade the site. This includes downloading upgrades, adding the blog and changing the graphics.

Here is the problem: I'm not sure where to do this. I don't have the vBulletin software, since it was purchased before I came on board.
<ul>Do I need to purchase a new copy of the software in order to make the changes--if so, could I change this as we renew our license?
Can I access the program on our hosting server and upload graphics that way (remotely)?</ul>

I would appreciate any advice.

JD