Retirement tax questions

Dear "Tax Experts" - You all may be experts in taxes, but you are not experts in reading and understanding the english language.  As I have explained MULTIPLE TIMES, the online Turbo Tax program will NOT allow me to enter anything in that field.  It REQUIRES that I select one of the two options from the drop down menu: "Blank" or "Various".  I know the date that I acquired the investment (February 5, 1996)  However, since Box 1b on my 1099-B is blank, I need to enter the data from my 1099-B which is to select the option "Blank" from the drop down menu.  The problem is with the Turbo Tax program; there is obviously a bug in the program since it will not allow me to select one of the options that are included by Turbo Tax.