Sorry to hear you are having trouble.
It may have been a momentary glitch when you were initially trying. Please try the following.
-Try to activate the trial again so as to trigger sending another activation email
-Check your spam \ junk folder
-If you have your mail forwarded from another web based account (hotmail, gmail), check that other account directly as well as its spam \ junk folder.
-If you have an alternate email, please try using it instead.