I can not get it to word.  If I go to “Forms” and try to enter it directly, it will not let me enter anything at all on 10b.   If I go to "Federal > I’ll Chose what to work on > Deductions and credits” then I enter $300 into Contributions.    Nothing shows up on line 10b.    I would have assumed the software would automatically put $300 in 10b. if I had made contributions and still used the Standard Deduction.