If you are referring to your PayPal accounts, you cannot link PayPal accounts to each other. If you are trying to link financials to each other, you will need to contact your financial institutions in order to do this. You can view steps on how to add a card to your PayPal account by visiting the link here.
I hope this helps!
Joy If you have found any post within the Community to be helpful, please leave a Kudos or Accept it as a Solution.
