Mortgage interest that is not on a Form 1098 and is not from a seller-financed mortgage can only be entered in forms mode. Forms mode is only available in the desktop TurboTax software, not in TurboTax Online. In forms mode, enter the interest directly on Schedule A line 8b. Do not use the Home Mortgage Interest Worksheet. When you enter it this way, TurboTax will not calculate any limits that might apply to the deduction, but if $600 is your only mortgage interest the limits are not going to be a problem for you.
