Does Anyone Know About This? Help PLease!! New to This

Hi, If anyone knows anything about this,please help me. It would be greatly appreciated. I am currently trying to create a weekly blog for my users at my site, http://www.seemeshowofftv.com
Although you can create pages through the admin, I cannot put certain php/css coding through these pages.

For example:

This is the page i created the through the admin:
http://www.seemeshowofftv.com/pages/news.html

Although this is fine,i cannot put php/html on the pages,

For example: I cant put php/html comment boxes,etc.

I'm thinking that if i make a page through the c-panel , the coding will show up.

Do the html pages i make through my administration panel, show up anywhere,inside my c-panel?
If so, please tell me how to get to the folder.

If anyone has done this before, please help me out.

Much appreciated thanks. :D

P.S If you are confused by my question please let me know,and i'll try to make the question more clearer.