The tutorials will be updated when possible. Right now our priority is getting the remaining plugins upgraded. Until those are done there will not be new tutorials. The HybridAuth page walks you through the configuration with screenshots. The CB Connect backend provides you with your Callback URL to be supplied to your application.
I'm unable to confirm your issue and am able to register/login perfectly fine with Google. Your issue is directly caused by misconfiguration. Your Client ID and/or Client Secret are not properly supplied to CB Connect or are invalid, which is what Google is telling you on their landing page.
You can generate API access from Googles API Console found below.
console.developers.google.com/
Your credentials are supplied and configured under APIs & auth > Credentials. When copying over the client id you need to copy the entire thing (including the .com). Example as follows.
Client ID: ##########.apps.googleusercontent.com
Client Secret: ASDASDASD_ASDASDASD
If you double click Client ID and try to copy and paste it's going to be invalid as double click won't select the entire string due to the period. The below is what you should see on the Credentials page.
Unfortunately it's just not possible to make this configuration any easier. The social sites do not provide a way to automate this configuration.