You can enable it from game settings.
More information about Mouse Controls
Please note that the mouse controls are only available on Adobe Standalone, Firefox, Opera (up to v12.18) and Internet Explorer browsers,
so if you would like to try this feature, you must download and use one
of the supported browsers (Chrome and Safari will not work).
but it didnt show up on my computer
I have a mac
You can double click on the screen, mouse controls should be activated and always make sure to check on the settings.
Customer support service by UserEcho