Need SEO Help

Hi can someone PLEASE help.

My SEO program tells me that I need to add <h1> and so on codes to my Headings for better search engine results.

When I follow their instructions on video from Google I am told to use the header drop down menue and change the sizes if need be in stylesheet ccs.

Firstly I dont have the toolbar with the Header drop down menu at the top of my pages for some reason which they tell us to use . I am using wordpress_jewel 1.0. for a theme I dont know if that is the problem???

Secondly when I try and do it manually the words come out huge and I cannot find any way of changing it in the stylesheet ccs.

When I change the font sizes in the stylesheet ccs as instructed in the video nothing happens

This is what my style sheet looks like thought I better include the lot as i am only a newbie and would proberly miss the one thing that is needed.

[Per the forum rules, please post ridiculously large code excerpts in the pastebin.]

I would really appreciate any help

Thanks
Shirley