Unplug the dryer and pull it out from the wall.
Remove the exhaust hose from the dryer. Use a screwdriver to loosen the clamp.
Disassemble the dryer according to the manufacturer's directions. Remove the drum and belt.
Install the side vent kit according to the instruction manual. If the dryer is gas, you can only vent to the left; the heater is located on the right side of the dryer.
Reinstall the dryer drum and belt according to the manufacturer's instructions.
Attach a vent hose to the dryer exhaust duct and the vent. Plug the dryer in and push it back into place.