Re: Can I alter my Ryanir "airport check-in" to "on-line check-in"
Basically you cannot get a refund for anything from Ryanair. If you do, you will find that adminstrative costs gobble up all you were due.
On the Ryanair Confirmation sheet you will see the section at the end on Important Information which states : "All fares, airport taxes/fees and charges are non-refundable".
Having flown them for 10 + years, its often cheaper to buy a new ticket than try to change an existing one.
HTH