To fully remove the belt, say to change it. The basic procedure is jack up the passenger side front of car. Remove tire, pull plastic shield. This will give you access to the lower motor mount bolt and stud. Once you pull the stud out, remove the spacer from behind it and you can get the betl out. Basic only..I did not include all the steps or safety items.
However in your case you only need to take the belt tension off to turn each pulley by hand and feel them.