Forsage works like a Multi level marketing matrix engine, where members earn when new members join their matrix. There are 2 types of matrix in forsage, Forsage X3 and Forsage X4 . Each matrix has 12 slots. The diagram below shows the shape of fosage x3 and forsage x4.

To join you need 0.05ETH, this will be used to buy slot 1 in Fosage x3 and Forsage x4.  When you refer a new member they fill empty positions in your slot 1. When they buy more slot for example slot 2 they will fill the empty position in your slot 2, however if you do not have slot 2, the member is passed on to your first upline with slot 2.