Unwind the earphones, and put them in your ears. If you intend to run with them, jog a little and see if they move around. The fit of skull candy earphones can be changed.
Loop the hard plastic pieces over your ears, if the earphones have them. These plastic pieces are found on the sport-style earphones.
Remove the soft plastic around the earbud itself, if they don’t fit properly. Replace it with a larger or smaller insert, as needed. The earphones come with these inserts in several sizes.
Plug your headphones into a computer or MP3 player. Turn on some music, and equalize it to sound the best for your new Skullcandy earphones.
Test your new earphones.