It's possible that the email may still be "in transit" to your inbox -- they can sometimes take a few minutes to appear on your end.
It's also possible that the message was redirected to your "Spam" or "Junk" folder by mistake -- so please be sure to check there, as well!
If you've been waiting for an excessive amount of time and the email message is not found in your spam/junk folder, you can resend the activation email HERE.
If you still do not see an activation email in your inbox, please contact Customer Support with an alternate email address so we can update the one associated with your account.
Gmail users: You may also want to check the Social, Promotion, Spam, and Updates folders in your Gmail Inbox.