Moving Blog Page

I want to move the page my blog is on, but I can’t figure out how. As far as I can tell, I don’t need to move wordpress to do this.

In Administration > Settings > General, WordPress address and Blog address are both at mainsite.com.

In Administration > Settings > Reading, I have it set as “front page displays static page”, which I have set as my “home” tab, and posts page under the “blog” tab.

What I want to do is have my posts display on my front page… but when I do this I get the message “Warning: these pages should not be the same!” (front page and posts page shouldn’t be the same).

Also, I don’t want my posts to be the only thing on my front page, I want them to come up under some other stuff I already have on there.

Thanks for any help :).