Add an email address to a whitelist

How do add someone onto my Whitelist?

You need to go to find out who your registrar is.

You can find this out by visiting www.names.co.uk and entering in the domain. This will tell you the name of your Registrar. Contact them and ask them for access to your control panel so that you can add people to your whitelist.
Alternatively, if you have webmail you may be able to add people to a whitelist under preferences or settings.