a Margaritaville Machine will work the best for this recipe...but if you don't have one, a blender should work just fine - it just won't be as fun.
Fill your Margaritaville Machine with ice. If you're using a blender, skip this step (obviously)
Dump the frozen limeade into the blender. Save the empty can.
fill the empty limeade can 3/4 full with Tequila and 1/4 full with Triple-Sec. Dump into blender with Frozen Limeade. If you're NOT using a Margaritaville Machine, fill rest of blender with ice.
I drew a diagram (in case you get confused.)
Blend! Texture should be almost creamy
Pour into glasses and enjoy! Makes about 4 servings. You can even garnish glasses with cute little lime wheels... but only if you're cute.