When you select Direct Deposit as your refund method you would need to enter both your routing number and account number. The MICR number and Account number should be the same thing.The MICR number is the account number listed on the bottom of your checks and is used for setting up direct deposits and automatic withdrawals from your accounts. Your 14 digit MICR/Account number can be found on the bottom of your check.
To be sure you may want to contact your financial institution for verification.
Here's an FAQ with additional information on where the routing and account numbers are located on you check:
https://ttlc.intuit.com/replies/3302372