With the Push/Pull tool (), you can create a 3D shape from a face or cut a 3D shape out of your model. You can push/pull any type of face, including circular, rectangular, and abstract faces.
The first time you use SketchUp, you need to sign in to activate your trial or subscription. After you're signed in, the Welcome to SketchUp dialog box appears, as shown here. This dialog box is your starting point for creating a model and appears every time you start SketchUp (unless you choose to turn it off in the SketchUp Preferences dialog box).