Article: On the end of the fish tape that you just pulled out from under the carpet, there should be a hook which you can attach to your cable. It may be helpful to use a bit of tape to secure the cable to the end of the fish tape.  If you are using a tape measure instead, try using duct tape to attach your cable to the end of the measuring tape.  Be sure the cable is securely attached to the fish tape or measuring tape so that you don’t lose the cable underneath the carpet and need to start over. This should pull the cable under the carpet along the path that you made using the the fish tape. Do not stop until you have pulled the cable all the way through the desired path. Apply the same method if you're using a tape measure. Your cable should now run along your desired path underneath your carpet! You can now hook the cable up as you please. If you had to loosen your carpet liner to lift up the carpet, retighten it by hitting it gently with a mallet or hammer. In pulling the carpet out, you may have also loosened nails in the floor. Use the hammer or mallet to gently tap on the carpeted area as well, to ensure that the nails are set back in place.

What is a summary?
Attach the cable to the fish tape. Pull the tape back through the carpet by rewinding the fish tape reel. Detach the cable from the fish tape. Reattach carpet liner if necessary.