First, you stamp your typewriter on grey CS, and cut it out. Glue it onto some DP, or other CS. Now you need to cut with a hobby knife where you can see the paper coming up in the image. Click on the photo for a better image.
Then you cut a piece of CS to fit in the cut you just made, leaving a bit extra on one end. This is to make sure that you will never pull it out. Stamp your words onto the CS, and then slide it on from the back. Now you can mat it on another piece of CS making sure to not glue where it will hinder the sliding CS. Have fun and happy stamping!!