Please could someone explain how does the triggers work?? I made some, and as I wasn't getting any notification, SO I made une for just an unicorn, and I never got any notification...(Plenty of unicorns have been put up for sale)

If they aren't being sent just check to make sure you are clicking it (I'm sure you have), that you have the correct e-mail in, and that your e-mail isn't filtering it out for whatever reason.

If none of that works you may need to post in bugs

All of my notifications send to my e-mail just fine. :)