The universal ‘No’ sign can be added to any cell

Have you ever run out of ice cream?  

That's OK.  If you don't want your student to choose ice cream from the desert menu today, just add the universal No sign on that image.  

The first thing you need to do is get into Edit mode. 

Now select the Ice Cream cone and you'll notice our new editing tool.  

Select 'Edit Cell -ice cream'

Notice on the left side in the 'Image' editing area at the bottom, there is something new.  Turn on the slider to the right of 'No > Symbol'

Voila.  Now tap 'Done' at the top right of the dialogue box to go back to the cell.

Finally, turn off edit mode at bottom right, and hit Done at top right to get out of Author mode.

Sorry kids, no ice cream today. 

Simple as that.  Turn it back on tomorrow when the ice cream gets here.