I cannot edit the whiteboard using mac book

When I write something on a whiteboard and I click outside the box, I can't go back do the box and correct some word or write anything else there. I've tried to to everything. I clicked on it lots of time, I clicked with with right side of the mouse pad, left, there's no solution. I could do it well when I was using Microsoft computer. Now, I have a Macbook computer and I can't do it anymore. Help me please. Thanks