Ok, so what you do is the first player would be number 1 and only do 1 enter then the next player is number 2 so will do two enters. What i mean by enters is the thing you press to go down a bar, It is also known as "return". You can post how ever much you like. You can either post an enter/return or you can post enter 1, enter 2 and stuff like that.
Heres how it works:
Player1:
Player2: Enter 2 (and does two enters)
Player3:
So i will go first as player 1 Enter 1