Account->Verify

Edit: if you have already requested it to send the verification email then either:
1) Check your spam folder and make sure kano.is is white listed
or
2) Check you didn't get your email address wrong

Edit2: and if you send a 2nd key, coz the first one hadn't arrived yet, the first one will no longer be valid, you'll have to make sure it's the 2nd one that you use.
The email also says when you requested it to be sent, so you can match that up.

N.B. most of the time when I see the key validation messages on the console they are about 1 minute after the key was sent,
i.e. the server is quick to send out the message, so if you don't see the message for 10/15/30 minutes, it's your email provider that's slow.