dthecreator,
This is your third post asking about this.
It looks like you are a new, inexperienced sweeper. On this website, you have been reading posts in the Winner's Circle, where other people received winning email announcements from the sweeps sponsor (not SA), then they posted about their win in the Winner's Circle. You read their post, in which they quoted their winning message. It apparently confused you, because they quoted things like, "you won." They, not you, won.
SA lists sweeps. You enter by reading lists of sweeps, in New Sweepstakes, for example, then clicking on the title of the sweeps...which takes you to the sweeps, where you follow the sponsor's instructions to enter a given sweeps. You do this for each individual sweeps you want to enter.
If you win, we at SA don't know. You will be notified by the sponsor (they should tell you in their rules if they notify by mail, email, text, phone, etc.). Except for Instant Wins, it could take weeks, or many months, or even a year after the sweeps ends before a winner is notified.
As you are new to this site, you need to read the section of the forum titled, Newbies, which has information which may help you.