You can add funds to any xWALLET by searching for its NFT domain & clicking on P2P.
Alternatively, you can access the same Add Funds interface on the DIDx wallet by selecting the ADD FUNDS card.
First select your Source of funds.
On Select coin, select the currency.
Then, enter the amount you wish to transfer in Type amount.
Click on TRANSFER & confirm this transaction with ZilPay.