You can either blog separately and essentially copy and paste your blog posts. Or you can add a RSS feed of your personal blog and your posts will show up on your page.
I have my regular blog feeding into MBC.
The RSS feed is easy to set up. It's already on your member page (I think mine originally was on the left hand column, toward the bottom). Just click on it and add your blog's URL. You can then customize it to feed the complete posts on your blog OR just the titles. I chose titles only b/c (1) my posts are generally long and it made my MBC page waaaaay too long, and (2) I wanted people to be directed to my blog when they click on the titles! :)
Kelly I am going to need your help with this!