If you‘re having issues activating your account even after you entered the activation code you received via e-mail, try requesting a new code. Click here to request a new code. Please check your spam folder as well. Sometimes you have to double-click the activation link in your e-mail to activate your account. That depends on your browser, mail client etc.
Still no activation mail?
It‘s also a possibility there was a typo in the email address you tried to register. With cases like these we advise you to contact the support to activate the account for you.