Ho do I use Revolut for PSN purchases?

Could anyone provide a step-by-step guid on how to use Revolut to make foreign PSN purchases? I can create the foreign PSN accounts no problem. I can download the Revolut app and get approved. I've been able to create a disposable card, but am unable to "add money", it doesn't ask for card details. All the help on the site say to click "add money" and then enter card details, but this doesn't come up.