Hi David,
1. Disconnect washer from electrical supply.
2. Remove rear service panel.

3. Remove belt by turning tub drive pulley and rolling belt
off pulley. The belt is elastic and is designed to "give"
enough to remove and install in this manner.
4. Reverse procedure to reinstall, making sure that belt
tracks in the center of the tub pulley. Adjust tracking,
if required, by moving belt on motor pulley.