So I Submitted a game and if it gets accepted then how do I know/edit the Game

Hit 'edit game' or 'edit theme' on the page of the game and then customize it from there. It's kind of complex, yet simple. I should probably add a guide on that to the FAQ.

Thank you but how will I be notified that the game is accepted

Check out section 19 in the FAQ thread: https://www.speedrun.com/speedrunning/thread/pt010/1#s77sn

@PlushieMasterYT if the game has been accepted, you just get a notification in the same way that a run was verified. You can also look at someone's info page (such as your own) to see what games you currently moderate just in case you missed the notification. It generally takes 2 weeks -> 1 month to get accepted or rejected.