1. First of All we need to Create a Membership that can be SELL in your site.
Go to admin panel: Members > Manage > Memberships
add membership, make sure you fill the "Ref Back Bonus
" field with Additional Percentage
and check the "Sell?" Checkbox. Eq: I named the membership RefBackBonus
2. After you Add the membership, then it should show in: http://YOURSITE.COM
with Your own live site.
3. IF a member buy this RefBackBonus
membership then he/she will get an
extra percentage than standard members. This can be seen in the Refback Site page, see image below
this member get additional 30%
Feel free to post if you had any question.