Use scissors to cut strips of double-sided tape the length of the area rug. Place several strips on the back side of the rug.
Decide where you want the area rug to go and remove the paper strips from the double-sided tape.
Place rug, tape-side down, on the carpet and press down firmly to get good adhesion between the rug and the carpet.
Purchase a non-skid rug pad (made to be used on top of carpet) at a home improvement or retail store.
Measure the rug with tape measure and use scissors to cut the rug pad a few inches smaller than the dimensions of your rug.
Use double-sided tape to attach the non-skid pad to the back of your area rug.
Place the rug with pad attached on top of your carpet.