I'm having exactly the same problem. I'd be glad to know if you find a solution.
Adobe couldn't have made this more complicated if they had said "Begin by trekking across Antarctica."
OK, jzanella, I have an answer of sorts for us. The problem is that you can't simply format the site on Behance and have it appear on your Prosite as you want it.
First, make everything appear the way you want it in the Behance editor: background, fonts, font colors, italics, etc., and save your work.
Second (my Prosite is divided into "Projects." I hope that yours is, too.), at the top level of the Behance editor click on "My Prosite" near the top of your display. On the page that opens, find and click the prominent green button that reads "Edit Your Prosite." Now you are in an entirely new editor, the one that should not be necessary.
In the Prosite editor, select the "Design" tab at top left. Select your Projects one at a time, and under each Project find and click the "Global Style Options." Uncheck both "Override..." boxes. This will make your Prosite look (more or less) the way you designed it in the first editor, the Behance editor. Click "Save Draft" and "Upload Live Site" at top right. Your Prosite should now look (more or less) the way you want it to.
If your Prosite uses a different design template from mine, I'm sure that you will find analogous commands to achieve the above. They key is, two web sites needed to create one web site: the Behance editor and the Prosite editor. Ridiculous.
I'm finished with Prosite. I have nothing to sell, not seeking a job. I had thought that, since it is included with Adobe CC, it might be fun to play with it. It has been neither fun nor interesting, so I'll just continue to share my photos on my Flickr site at http://www.flickr.com/photos/primeval.
For now, my Prosite is at http://www.littlethings.prosite.com
Helllo - sorry to hear you're having trouble! Since each ProSIte is very different, please write us a ticket here so we can correspond one-on-one and give you individual help:
Thank you! I will definitely try that.