In order to contribute you will have to edit the code and make a pull request, then CoderGautam will review it and see if it will work out good. We do suggest you to have Discord although.
When contributing you must have these requirements:
1: Knowing basic coding 2: Must not make a file that contains viruses/computer damage and request it as a pull request. 3: You must never make a SwordBattle.io exploit
These are mainly suggested in order to be a good contributor!