Select your account menu and go to "Invite a friend" or visit the referral page . You can opt to send your invite link or send a personalised invite.
If you opt to send a personalised invite, you can fill in the form on the referral page with the e-mail addresses of the people you want to invite. They will receive an e-mail with your personal invitation. If they register with Goboony and make a booking, or, they list their campervan and receive a booking, you will receive an email where you can select your rewards.