Logo in BlogsMu


I would do well to say I am new to this.
WP3.0 and BP

I've just uploaded the BlogsMu theme..
I am trying to swap out the logo.

I've allowed multi site.
So I've enable both parent and child.
I've got only child activated.
I've upload a new logo.png to the _inc/images
Should I expect this to do it?

If not can you help?