Pull your refrigerator out from the wall. Unplug the refrigerator. Maneuver the refrigerator so you can get behind it and move a little.
Locate both the water supply line behind your refrigerator and the hookup on the refrigerator itself. Make sure the water running to the water supply line is off.
Remove the plug from the tip of the refrigerator water tubing or valve inlet.
Attach the water supply line to the valve or refrigerator water tube using a nut and an adjustable wrench. In most cases, you'll need to slip the nut over the tip of the water supply line before connecting the line to the refrigerator hookup. If the refrigerator tubing is not long enough to meet your water supply line, add a 1/4-by-1/4-inch coupling to lengthen the line before attaching the nut.
Tighten the nut. Do not overtighten.
Turn the water supply on to make sure the hookup or tube isn't leaking.
Push the refrigerator water tube into the tube clamp on the back of the refrigerator, if present, to avoid damage to the tube once the refrigerator is back against the wall.
Plug the refrigerator cord back into the electrical outlet. Maneuver the refrigerator back into the correct position.
Hold a bowl or glass under the water dispenser. Push the dispenser lever. Fill the bowl with water. Repeat the process until you've filled and emptied approximately 3 gallons of water from your water vessel. This removes any air from the line.