The steps are:
- choose Easy Mode
- click the Start Game button
If it still doesn't work, try a different browser.
I'm really sorry to hear that. This game is old and I do not update it anymore, but I'm still happy when someone plays it. I've been working on a sequel, which should solve all compatibility problems. But I don't have plans for release yet. For now, if you can use Firefox, the present one should run fine on it. Sorry for the inconvenience.