You will know because when you try to register from an IP address that's in a non-approved country, as the last stage you'll see a message saying
"Your account has been created. However, this forum requires account activation by the administrator for users from the country we believe you to be in (based on your IP address), to help prevent spam posts. An e-mail has been sent to them and you will be informed if your account has been activated"
If you didn't see that, then your IP address doesn't appear to be from a non approved country, and so you should be able to activate your account automatically by clicking the link in the email.
To be absolutely clear, I'm not saying you can't register from certain email services (though some russian ones used by spammers are permanently barred, and you can't even get through registration if you use one of those).
All that happens is that, if the IP address (nothing to do with the email address) that you use when you register does not appear to be from the EU or Australia, then you'll see the message I quoted, and we'll have to approve your account for you.
This is explained in the forum FAQs at
http://forum.toppy.org.uk/forum/faq.php#2
If you didn't see that message, and you still haven't had a confirmation message - which should arrive within a couple of minutes, normally - then perhaps some filtering is blocking the address.
One cause could be that you're using a mail forwarding service, and you've given an address using registration that then forwards mail to somewhere else. Since we use SPF to prevent the Toppy.org.uk domain being used to send spam, forwarding messages from the site will likely make them disappear too.
If you still have difficulties, asking the admins via admin @ toppy.org.uk is the best solution, remembering to say which username you created, and which email address you used.
Nigel.