Via your My48 account Dashboard?
But what exactly do you mean by "credit"?
Calls/texts/mobile data allowances?
Roaming mobile data allowance?
Cash credit?
Membership plan days?
Something else?
(Remember that the €12.99 membership comes with unlimited Irish mobile data so that will never run out).
If you need to contact 48 support about this then see the links in my signature below.
