To add a bank account by the routing and account numbers, the first thing you need to do is press the button "CONNECT BANK ACCOUNT." Next, follow these simple steps in this tutorial video:
Once the bank account had been added you will need to verify it. In the next several days you will receive two micro-deposits in the range of $0.01 - $0.99. Once you will get them, you will need to return to the iWallet app and confirm the amounts to finish verifying the account:
Finally, once the micro-deposits are verified, you can select the new added account as the default one by clicking on the account:
Now you have connected and verified your bank account as a default funding source for you iWallet account.