Festina 6717

Question

I have problem with using the stop watch. I don't know how to do it exactly. Been trying randomly to press buttons and sometimes it works (most of the time it doesn't). The thing is that I don't know in wich order to press buttons to get it started and stopped, lap timing... Also tryed to to find manual online but it seems impossible. I got one of those together with the watch but it says nothing about stop watch. Can anyone help me?