A preview of the firing, not a simulation: the piece stands as it does here, so turn it with a stand before you judge the runs. Bake and Publish graphics carry the fired glaze while Fire is on.
With a mouse, Alt-drag or a drag off the piece turns it with any tool. On touch two fingers turn and zoom, three move the piece.
No tape yet. Choose Tape and drag a rectangle on the piece. Paint stays inside it, like masking tape.
Paint lands on the first surface the tape sees; Reach adds mm behind it, Through paints everything the tape faces.