It can take a while for the activation email to arrive (depending on a lot of factors). If you really didn't get it, check the following:
- Make sure the activation email didn't go into your junkmail/spamfilter/thrash.
- Make sure you typed your email address correctly (you can only check by trying to make a new account with the same email)
You can request game staff to manually activate your account by sending a message by the contact form in the menu. Please only do this if you are sure you typed your email correctly and the activation email wasn't filtered.