The pointer is the little plastic triangle on the front of the tensioner, by the 19mm bolt.

You'll have to pull the fan shroud and the fan using an 8mm allen and a retaining rod to hold the clutch.

Loosen the 19mm bolt.

Untension the tensioner at the 13mm adjusting nut.

Pull off the belt. Spin the pulleys and check the bearings for noise or roughness.

Install is the reverse. Make sure you reset the pointer at the low end of the triangle (right side), and tension til it hits the peak of the triangle (left side).