Hiding Frontpage Category Posts From Blog Page

Hi. I just purchased my Catch Evolution theme today and I already really like it. It is SO much better than my old theme. I have a question, though. In Theme Options, we are given the opportunity to single out certain categories of posts to display on the front screen. This works great, and is something I've wanted for a long time. My problem is that these category posts STILL show up in my blog which is separate from my front page. So, just to clarify, I want to have ONE category (called Homepage) show up on my front page. This WORKS. PERFECTLY. But I don't want any "Homepage" categories to show up in my blog and right now they do. Is there some sort of plug-in that could help with this? I'm pretty dumb when it comes to PHP. Thank you in advance, Michael Hiebert