Rub wax between index fingers until melted (no clumps).
First work the wax into the underside of your mustache. Then into the top side.
Using a mustache comb, comb the wax into your mustache hair. The trick is to get it evenly distributed. Brush sideways, outward.
Twist the ends to get that nice curl.
If you want more curl, add a bit more wax to the ends of your stache.
Mustache wax needs to be reapplied every now and then. That's why it comes in such a small tin - it's pocket sized. Keeping it in your pocket also keeps it close to your body, giving it body heat throughout the day and keeping it soft and semi-melted. When you need to apply on the go, you'll be able to just rub your finger on the top of the wax, similar to using a tin of lip balm.
Mustache combs are absolutely crucial.
There is such a thing as too much wax. When you're working your handlebar mojo, be sure you don't put too much wax, or the ends will become heavy and might start to droop.