There are several reasons why your earphones may not be connecting to your device.  Make sure that Bluetooth is enabled on both devices, that the earphones are in pairing mode (by pressing and holding the power button until you hear a voice prompt), and that the name of the earphones ("Skullcandy" or whatever you have renamed them) is appearing under the list of Bluetooth devices on your device.  If all of these check out and your earphones still aren't connecting, try resetting them by pressing and holding the power button for 10 seconds.