Retirement tax questions

Need help along on this subject.  I have a IRA, distribution code 7 and 1 and 2a are the same, 2b Taxable amount not determined is checked.  All money in this IRA is post tax money so how do i get this info into TT.  Currently by cost basis is 11K but i am being taxed at 50k for what i took out.  Even if I enter 11K into box 3 it doesn't change my tax obligation.  It is still based on 50K. Help please