playing both sides???? how can I do this?


Chess is a game for two players. If you play both sides, you presumably know what both sides are trying to do and the game has little point.
That said, there is a feature called Pass and Play on the apps for playing a live game with your friend. You could certainly play both sides.
You can also go to the Analysis board on the website and start making moves. You can turn on the evaluations if you want. https://www.chess.com/analysis