Reference isn't valid

Occasional Visitor

HI. 

I wanted to insert the column box to select form to sort out my references of reading for the dissertation work. However, I didn't realise I had to create a table of options first, rather type in after. I have the reference isn't valid continuously, unable to delete or undo those actions, therefore unable to close the file as well. Please, help.

How can I delete these.. I am unable to select anything in Data validation etc. 

 

1 Reply
Are you referring to combo boxes? Try right clicking the combo box if so, sometimes that works to select a form control.