To access the washer, use a putty knife approximately 1" in on both sides and push in to release the top panel and lid clips.
Lift the top panel back towards the wall, be careful to tape the lid so it does not fall back and chip. On the inside of the front panel are two 5/16 screws. Remove them and the top of the front panel will come out towards you, then lift the front panel off the clips on the bottom and set aside. You know have access to the internal workings of the washer. To access the belt, pull the washer out from the wall and lift up the front and support it with a block of wood, the belt is installed from the bottom.
On this picture, we had removed the tub and transmission assembly to replace the transmission.