How do you put a colored background in a video?

hi, started using adobe premiere elements 11. trying make promo video someone, need colored background, not picture. looked on program , can't find out how.

 

thank in advance can give.

is want?

http://www.adobe.com/cfusion/search/index.cfm?term=green+screen&loc=en_us&sitesection=prem iere-elements%3atopics.html

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