First of all do not use the 'Best Printing' on the machine so you will not have too much ink. Many people still teach using the Best set, but it is usually better if you don't.
After printing let the ink dry, separate the freezer paper from the material, then iron to set the ink using something to protect your ironing board. Newspaper can do this. You can iron it a second time if you feel like it. Leave it alone for a while then it is ready to use.
Otherwise ... you can use a soda ash preparation that you make yourself. Directions are available on various art sites on the web.