If the funds are already in your Interior FCU account you can simply make the transfer.  If not then you can go about it one of three ways: 1) Take a check from an external account of yours and make it payable to yourself, then you can login to the Interior FCU mobile app and deposit the check into your account.  2) Login to Online Banking and Move Money tab, then External Transfers and Transfer Between My Accounts. 3) Visit a shared branch and make the payment in person.