First of all, double check if you wrote correct email address when registering an account.
Remember to check your mailbox carefully along with Spam/Junk folders, as the email might go there.

To resend activation link to your email address:​
   1. click Can’t sign in? on start page;
   2. choose I haven’t received the account activation email;
   3. type your email address and press Resend activation link. 

If there is still no activation link in your mailbox, fill up the below Contact Us form.