Click the menu button on the upper-right and select Browser Login
Enter your Google email address and password
Be patient until the error message appears. It is normal for an error prompt to appear during communication with Google servers.
For multiple Google accounts, after setting up the first and verifying, you can proceed to add more afterwards. They will usually say an error has occurred as well. Ignore it and proceed to the next step.
Install file number 6 in the USB: 6.GG.Services.Framework-29-v10.apk
After installation, go to Settings > Users & Accounts
You will see your Google account in there as well as the other you may have used even if you get an error during the previous login attempt at Step 4.a.
You will also start receive a lot of notifications about Play Protect ignore for now as we will fix them in a later step.