Freezer paper and Wax paper are two Very Different products. I use freezer paper often. I cut my freezer paper and fabric a little larger than regular printer paper, iron them together very well, making sure there are no wrinkles or air bubbles. Once they are pressed together we’ll I cut them to printer paper size- then I use paper tape to secure the edges all the way around. I’ve been printing on fabrics for 20 years this way.
make sure you have good quality Permenent ink in your printer. ( regular cartridges are water soluble- will wash away.