Even the original database of your file on Beginner #8 does not work either; it does not pop either. I can send you the file that I modified in the table itself.  I did follow your steps over and over again making sure that I did miss anything.  Let me know; b/c I can send you the file.

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Reply from Richard Rost:

I just downloaded the file and tested it with Access 2010 and 2013 on two different machines and there's nothing wrong with the database file. I think the problem is you expect the form to just POP UP if you type a value into the box that's not there. That's not quite how it works.

If you have LIMIT TO LIST set to NO, which is how I have the download database setup, then you can just type whatever values you like into the combo box and it will save them. If you want to edit the list values, you have to click on the ADD box that appears below the open combo box.

if you set the LIMIT TO LIST value to YES, then you get a prompt that asks you if you want to edit the list items. If you say YES to that prompt, THEN then your add form pops up.