Back door IRA help needed

I used AFTER TAX money to purchase a $7000 IRA and then subsequently converted it to a ROTH IRA.  When I input the information into Turbo Tax - it seems to want me to pay taxes AGAIN on the $7000 (that I already paid tax on) as it reduced my refund amount once I entered the information.  What am I doing wrong?  How do I enter it properly in Turbo Tax?  (PS - I checked and I met all of the qualifications for the "back door conversion" of the IRA to ROTH).  Thank you 😄