changing backgroud body

Dear all,
I’m new in the world of WP. There I’m looking for some help overhere.
We (rugbyclub) bought a the themeForst Slpash.
I’m try to change the background from colour into a picture. These dosn;t work however every thing is set to BG picture. How to sove
Second problem. I would like to stick the fotter to the body where the text is shown. So it will move when you scroll up and down together with the “body”
Help will be apricated


The best way to get the support is Contact your purchased Item Author and let them know. Item Author will assist you.