mmobytes on "Posts can be assigned to categories, but how do I assign them to a page?"

My site is http://www.mmobytes.com and I am using the game fusion 2.1 theme from:
http://newwpthemes.com/gamefusion-free-wordpress-theme/

I want to create a post, have all of them show up on the "Main Page" by default. But I also want to assign the post to specific categories, and also pages. Or.. lock category to a page. So that when I post, the post is identified in a type of category, shows up on home page, (which it does), and last I want the post to also show up on the specified page. (which it does not.)