You can access your Main Screen by taping on the central icon on the options bar located on the lower part of the screen.
There you can see:
Your profile: to access your profile, press on your username or profile picture (if you have your account linked to Facebook), located on the upper left corner of your main screen.
Your current coin balance, on the upper right corner of the screen, next to 'Settings'.
Guess the Word: you can choose this game mode by selecting 'Play Now'.
All your current games, including the ones that are waiting for your turn or your opponents'.
The option to start a new game, on the lower part of the screen.