Go to CBS.com but, casting calls end in the beging of april so I think your too late.Also, CBS.com took down the applications link to know why check up www.must-see-tv.com lots of useful info there about how to be on shows and stuff. Check out the thread Half-Stars or All-stars in the BB7 Section.
the main thing is you must be the age of 21 to even apply to be on the show, im almost there my self, so you just have to wait a bit longer, and dont worry big brother has been signed to a 7 year deal so you will have may chances to get on.
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