You can do that by addidng the credit card dashboar.
Be assured that you can link both accounts on the app and be able to transact. If this is still the issue, kindly email us with screen shots of error so that we are able to address your query accordingly. Please email us here: [email protected] using subject line"Linking accounts/Community query".
Please be advised that one of our customer care consultants can assist with the linking of cards. You may contact 0860 123 000 in order to be assisted with the linking of cards.