As long as you have attached your email address to your Skillz account, you can log into any Skillz game on any compatible device. Open the game and click Sign In. If you don’t have a password, click on Forgot Username/Password at the bottom of the screen and enter your email address. You will receive an automatic email with instructions on how to set your password.
Sometimes, opening a new game will automatically log you in as a new user. In these cases, go to Account and then Log Out before completing the steps above.