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Belt sizes and lengths vary depending on the brand and style, so it’s important to get a perfect fit. First, check the user manual for your washing machine to see if it specifies the part or size you need for your belt. If you can’t find it listed in the manual, search online for the brand and model of the washing machine so you can find the right belt that fits.  You can buy replacement washing machine belts online or from specialty hardware stores. Don’t try using a belt made for another machine, or else it may not fit or work properly. The drum pulley is the large circular part that connects to the machine’s drum. Make sure the belt has the smooth side facing outwards and the grooved side facing inward. Loop the belt over the drum pulley so it fits into the grooves going around it. Let the belt hang loosely from the drum pulley for now. Don’t try to loop the belt around the motor pulley yet since it will most likely be too tight to position correctly. Hold the belt tightly against the drum pulley so they make firm contact with each other. Feed the end of a zip tie through a hole in the drum pulley before securing the end in the clasp on the other side of the zip tie. Pull the zip tie tight so it holds the belt in place against the pulley. You don’t need to use a zip tie, but it makes it easier to stretch a tight belt that’s hard to install. Locate the motor pulley, which is the small circular part connected to the machine’s motor and spins the belt. Pull the end of the belt tightly so it stretches around the motor pulley and fits into the grooves. It’s okay if the belt hangs loosely from the drum pulley for now as long as it stays in place where you put the zip tie. Consult with the owner’s manual if you have trouble determining which part is the motor pulley. Open the door of the washing machine and reach inside to hold onto the drum. Slowly spin the drum clockwise to rotate the pulley. As the drum spins, the belt will align itself on the pulley and become tight. Keep spinning the drum until you make 1 full revolution to ensure the belt stays in place.  The drum will get more difficult to turn as the belt stretches on the pulleys. You can also try spinning the drum pulley itself, but it may be more difficult. Spin the drum until you position the zip tie in a place that you can easily reach. Carefully slide one of the scissor blades underneath the zip tie, and squeeze the handles together to cut through it. Pull the zip tie out from underneath the belt carefully so the belt doesn’t slip off of the pulley.  Don’t leave the zip tie inside your machine since it could cause the belt to slip or cause damage. Be careful not to cut the belt, or else it could snap off more easily.

Summary:
Get a belt that matches the brand and model of your machine. Align the belt around the drum pulley so the flat side faces out. Secure the belt to the drum pulley with a zip tie. Loop the other end of the belt around the motor pulley. Spin the washing machine drum so the belt aligns on the pulleys. Cut the zip tie off of the belt with a pair of scissors.