Investors & landlords

Now, I made the grievous error (sarcasm, sorry) of putting a period after my middle initial on the ND return form, hence "too many characters" in middle initial box.  TT keeps telling me that, highlighting the box with an "A." , but will not allow me to correct it!  So I cannot e-file the stupid return.  What to do?  I'm frustrated.  Yes, I have highlighted the box, tried overtyping, hitting delete, hitting back-space, but nothing happens..