Move from subfolder to home page.

Hi there,

I use the latest wordpress and yahoo hosting.

When I installed wordpress originally, i installed it in a subfolder of my site /blog/ I will like to move it to the root folder, the homepage… As I want to use a theme that can only be installed on the home page.
I cannot find any help for this and yahoo are horrible when it comes to customer support, I dont think they’ve ever replied to any of my emails. EVERR.

So if anyone here can help me, I’ll be soo grateful.

Thanks.