i got a letter in the mail for a discover card and 1% cashback on all purchases so how do u get the cash back? and when? i mean like the end of the year?

As I recall, the cash back can be in the form of a check or as extra credit on your card. Usually it takes at least six months for the first reward period to close. Sometimes it can be sooner. It has been a while since I had a Discover card but I seem to recall that the more you spend the higher the rewards and I think the company sets their own ceiling as to when they will release reward monies.