HELP ~ Trying to insert PHP code into mySQL database pages, Dynamic Web site ~ HELP

I can't seem to get anything to work when I paste PHP code into my database pages~ My main content pages are all coming from my database, but it seems to only work when I paste plain html or text.

Here's my site: www.sealteamrealty.com/inc

As you can see, the only page I have is the index.php, then my content is just dynamically inserted into my pages.

But now I am trying to use Jformer forms, and a php calculator into my main 'white' content area..

Who can help???