Open the Advanced tab in the Splashtop Streamer dialog box. (Or Network tab if using v1.x Streamer.)
Enter your Google credentials here. Make sure to type in your full email@example.com (or firstname.lastname@example.org) in the E-mail field. After you enter your Password and click the Login button, you should see a successful login message if your account is successfully logged in.
Splashtop CamCam iPad and iPhone / iPod touch client:
Download the client from the iTunes App Store and open it.
Go to the Splashtop Remote global settings by clicking on the gear icon in the upper right corner.
You should see an "Internet Discovery" option listed there. Tap it to enter another screen. You'll be asked for your Google Email and Password. Enter your Google credentials here. Make sure to type your full email@example.com (or firstname.lastname@example.org) into the Email field. After you enter your Password, tap "Sign in." You should see a green checkmark if the account is successfully logged in.
You're done. Your iPad / iPhone / iPod Touch should be able to automatically discover your computer now.