Step 2: Cut to Size
Cut the freezer paper to an even larger size to give you a nice margin of error here.
Step 3: Iron Together
In other words, the working surface is safely facing the bottom and the paper side of the freezer paper is facing you. Now iron it together. The two pieces will become one.
Step 4: Cut to Size - Part 2
Step 5: Stick it In
Step 6: Print!
You can print anything you want. I found this technique because a friend wanted to create some treasure maps for a pirate party. If you want the image to be on something that will get a lot of use you might want to treat it with this stuff.