affiliates box not showing in MarketPress

Hi,

I have the MarketPress addon activated in the Affiliates plugin here:

http://miraclesfor.me/wp-admin/admin.php?page=affiliatesadminaddons

However, when I go to MarketPress payments screen, there is no Affiliate Settings section where I can set the commission rate here:

http://miraclesfor.me/wp-admin/admin.php?page=store-settings-payments

I have activated Support Access.

How can I resolve this?

Thanks!

David