I'm having trouble connecting Paypal with Marketpress

Okay. So i've got Marketpress installed and am trying to set up a Paypal chained payments gateway. The instructions are not ... simple enough for me.

This is the site - http://www.thelotusbridge.intothemythica.com

I can set up support access if necessary.

The store is a basic one, my first one in a series. I'm unsure if we need Paypal activation stuff or how to set up the chained payments. I would like some advice in simple forms on how to do this. Please.