Turn over the mat to inspect both sides. If your mat has a nonslip surface, characterized by rows of bumps or other small protrusions, turn that side down on the carpet.
Cut strips of double-sided carpet tape slightly shorter than the width of your mat if it does not have a nonslip underside.
Peel the back off a strip and affix it to one side of the mat, running along the width. Apply another strip every 6 inches along the width.
Remove the backing strips from all of the strips of tape and flip the mat over to place it in the desired position on the carpet.
Press the mat with your open hands, working along the length to bond the tape to the carpet.
Pull up the mat when you are finished. Peel off the tape carefully, because some mats are made of a neoprene material that may rip or tear.