This step adds a command that tells your probe to move to a new angle so that it can measure CYL3 on the front face.
From the Edit window, make sure your cursor is at the end of the LIN3 command.
From the Settings toolbar, under Probe Tips, choose the calibrated active tip angle of A90B-180. This inserts a TIP/T1A90B-180 command into the Edit window after that LIN3 constructed feature.
Go to the next step: "Add Another Clearance Plane"