how to measure clicks with affiliate plugin

Hi... I am using the affiliate plugin and marketpress plugin (the add-on is already enabled)

The first action in my funnel is for people that are referred ask for an invitation, after we send the invitation, they will be able to access the shop and buy.

My affiliates will use their affiliate link to invite people, so I would like to be able to track the invitations I am sending from what affiliates are...

Any thoughts are greatly appreciated...