1.Download 2D/3D Chess and install.
2. Click a game room on the left game tree, a menu will pop up,
then click 'enter game room'.
3. Click beside a table to sit down , then click the 'play now' button,
now you are ready to play.
4. If another player sits down beside the same table and clicks the 'play now'
button, the game will start at once.

Yes, most games support practice mode. Just enter the practice room in the
game tree, then click beside a table, the game will start in practice mode.
Please note you can't get rates in practice mode.

Click on a piece first, then click the desired place.