Help with having layer appear

Create a variable called count that starts with value = 0. On main page thee are 3 buttons leading to 3 different sections. When user completes a section there is a button taking them back to the main page; before they go back to main page there is a trigger instructing the variable to increase by 1. After viewing the 3 sections, the variable should now have a value of 3. I've set up a trigger on the main page so that when the variable equals 3 or more, a layer is to appear. This layer shows a button that directs them to a web page. However in running the file, the new layer doesn't ever appear. Any suggestions.