Not laughing. The kit is actually pretty cool.
Select the size of outside mold you want: 1 1/8" (torquoise), 1 1/4" (dark purple), or 1 3/8" (light purple)
Decide if you are going to make an oval thumb or a round thumb
Select the size you want.
Place the outside mold over the insert and fit tightly
It does not work with the 3 to 1 ratio plug material.
You use the Wizard (or some other company) fast plug 1:1 ratio plug material. Mix up the plug and pour into the mold over the insert.
Let sit for about 2 hours (sometimes you can get by for a little less).
Remove the insert, tap out the oval or round thumb sleeve and insert into the bowling ball. Bevel as desired.
You can also make your own solid slugs, just don't put in an insert and use the slug cap.
Works really well.