New Banner Help!!

Hey I made a new banner via PhotoShop CS2
And I was wondering if anyone Knows how to put the banner on.
I have seen banners in blogs such as
Lipglossmagsd.blogspot.com * click to visit site*
Which is Vasia28's blog
If you know how to please contact me
Also, i havent had very many people respond to my 'Help Wanted' add!!!
♥
Fairylovergirl
A.K.A
Corrinne