First, check your spam or promotions folder - verification emails are sent from notifications@xerionsoft.net and occasionally get filtered there.
If it still has not arrived after a few minutes, go to the login page and look for the Resend verification email link, which appears if you try to log in before verifying. This sends a fresh link to the same address.
Typed your email wrong when signing up?
No problem - just go through the sign-up form again with the correct email address. It will pick up where the mistyped attempt left off rather than blocking you.