Thermostat change 99 4 cylinder

Hi, I am using my Dad`s account to ask this question. He is tied up with family business and I am trying to get my Jeep ready for moving on to campus.

Have a new dealer supplied thermostat and gasket. Need to remove the lower bolt on the housing but I don`t see how to loosen the serpentine belt.

YouTube wasn't much help.

Any thoughts or direction on a 4 cylinder with AC on how to loosen the belt ?

Thanks !!

Thermostat change 99 4 cylinder