Once you exit the visual editor, you should be back in the Google Optimize interface. You can scroll down in this area to configure other settings as needed.
For example, you can add more variants, change the traffic weight between variants, only target specific types of users, and more.
Make sure to choose a primary objective in the Objectives settings, as this is what Google Analytics will be measuring between the variants. You could set up custom events to track button clicks (tutorial here) or you could test generic things like bounce rate.
In the Settings area at the bottom, you’ll also see a prompt to Check installation, which lets you verify that you installed the Google Optimize code snippet correctly.
If you’re using an ad blocker, make sure to disable the ad blocker on the website where you’re running tests before running the diagnostic. Google Optimize will open the actual site in your browser to run the diagnostic – so if you have an ad blocker enabled, the ad blocker might block the Google Optimize script and your site will “fail” the diagnostic even if you properly installed the script.
So – save yourself some frustration and make sure you disabled your ad blocker before you go on a wild goose chase trying to find what’s going wrong.