Once you are logged into your account, select "Services" from the left menu, then "Add External Account". You will need the routing number, account number and account type. Once you submit this information, two "micro" deposits will be sent to the external account within 5 days. Once you have received the deposits, make a note of the amounts. You will need to log back into your Rally account and return to "Add External Account" to verify the deposit amounts and link the accounts.