Adjusting the view
In the main view there should be nothing but a gray field. This is because the mug is bigger than the current view so now is a good time to list the many ways to change the view in Blender.
Note
Rotate the view: Use the 8, 2, 4, and 6 keys on the number pad to rotate the view. Use the 7, 1, and 3 keys on the number pad to jump to the top, front, and right-hand side views. Use Ctrl + Numpad 7, Ctrl + Numpad 1, and Ctrl + Numpad 3 to jump to the bottom, back, or left-hand side view. Pressing 5 on the number pad toggles orthographic/perspective view which means the view is either rendered with perspective like in real life or without like on a grid that is usually easier to do editing in. These options are also available in the View menu at the bottom of the 3D View panel. Click-and-hold the middle mouse button (or your mouse wheel) and move the mouse to rotate the view.
Zoom the view: Use Numpad + and Numpad –, Ctrl + and Ctrl –, or spin the mouse scroll wheel to zoom in and...