I subscribe to Sketchup Go but I can’t find it. I found Sketchup Free with browser. I don’t know how to use my Go subscription.
If you are signed in with the email address you use in the forum, the web version should be showing the extra Go features. If you’re signed in with a different email address, when you are modeling you will see an Upgrade button in the lower left, and the SketchUp logo in the upper right.
If you don’t see those, then what you are looking at is the web application part of SketchUp Go. You also get the iPad app. You download that from the App Store, then make sure to sign in with the same email address. That will enable the editing features of the iPad app.