The following instructions are of those with Android 4.2 or higher.
1, Select Settings, click on add account and select Google
2. Create an existing account, enter your Google log-in info and agree to Terms and Conditions
3. You may be given the option to join Google+ and opt in to Google Play, you can choose to set these up or select Not Now.
4. You should now see Account Sign-in Successful. You may choose to sync calendar and contacts as well.