You will need to release one end of the drum to get the belt onto it. The front is the easiest to do . remove screws around doorway and front panel and move panel forward JUST ENOUGH to get belt between it and the drum. Not a particularly easy job and if the belt just goes around the motor pulley and drum it will be murder tight elastic belt there is a special tool to stretch the belt. If the belt goes around 2 tensioning pulleys it will be easy.
Kenjo, April 2012