HTML Theme Implementation Help

Hey,
I know this is probably a simple thing to do, but if someone could tell me how, or point me in the right direction as to how I would take wordpress and place it on one of my websites. I have a HTML website and I want to keep the background/page as it is but just stick the blog part on the page. So instead of another theme, I just have my website. Hopefully this made sense. Someone, please help. Thanks.