The CHECKMATE COIN Lichess group is open to all participants: https://lichess.org/team/checkmate-coin.

To be part of it, you must register on the website www.lichess.org from your computer or from the browser of your mobile device, go to Community, then to Groups, click on the "All Groups" screen and search for "CHECKMATE COIN".

Then you have to click on the group left during the search and click on "Join".

You will automatically be included in he CHECKMATE COIN Lichess group and will be able to participate in group tournaments.