During the course of play, you'll see some of these buttons /
If you can't make a word, click on SWAP to exchange your tiles. This will cost you a turn
You'll see PLAY only after you start forming a word. Once you're done, click on it to submit your word.
To wait for an opening or for strategic reasons, you can click on PASS to let your friend play their turn.
After playing your move, click on NEXT to quickly load the next game in which its your turn to play.