Your referral link will look like this: https://pervirtue.com/?refaqb=2 with the number 2 replaced by your own membership number.
You can find the link on the account page in the affiliate\referrals widget. You can highlight the whole link (which is not fully visible in the window) and copy it.
If you like you can send emails from this site by using the send invitation button on this widget. We recommend however that you copy and paste the referral link and send invitations from your own email account so as your friends recognize whom the invite is from.
Please refer to the screenshots which follow if you need help in navigating to this feature.