Any Blog Techs Out There? Help!

If there are any blog technofiles out there I am begging for help here.

I love the minima template...and I did manage to install a 3 column version of it...but I cannot change the header.

I can create the graphics but I cannot for the life of me figure out how to change the header in the code.....

Is there anybody out there who could maaaaybe have pity and actively help me do it?

I feel like a geek for asking....but I've wanted to do this for a long time and haven't been able to.

Any help would be greaaatly appreciated! ----Geoff