what is meant by 'press the sit button to play the game and how to download games?

Answer 1

This kind of game is checker and it means that you could play the game by click on the required button for example if you want to watched the game click on sit which means you can not interact with you opponents.

Answer 2

that means you claim that seat cuz somebody else can be looking at the same board game and they could seat before you do, so you might wanna say sit quick