Begin by setting another save point (Press F2, then Numpad +, and click on Save As Blender File).
Right-click to select the mug body or choose the mug body in the Outliner panel.
Jump to the front view (Numpad 1) and center and zoom (Numpad .) on the mug body.
The border select operation is another way to quickly select multiple objects or, in this case, points for editing. Like the circle select tool while in wireframe mode, the border select tool selects all vertices that it surrounds, even if they're overlapping other points on the screen. The following are the steps for border select operation: