I want to know how to win by playing this opening
You have to checkmate your opponent ;)
You need to check mate him/her to win
Checkmating is not the only way to win in chess. If your opponent makes an illegal move you win the game. If your opponents time reach to zero you win again. If you opponent break ethical rules (eg. he punch on your face) you can win. etc.
I think the answer you're looking for, is that the strength of the London system (I think) is that is allows you to have a relentless attack on your opponent's kingside. I think the biggest mistake for black when playing against the London is to castle kingside, then it makes it relatively easy to use your king side pawns and a battering ram (rook and queen) to storm the king side where black's king is trapped.
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