TT is a DIY income tax program and there is no place to enter in your third party authorization unless you mail in the return with the POA .... or ... if you are not a paid tax pro and are just "helping" your dad complete his return then "he" can e-sign the return in the program by picking a 5 digit number to be his signature and efile the return ... just follow the screen instructions in the FILE tab. Many family members "help" their loved ones complete their returns ... I would use this option.
