The cost to get started with Forsage at level or slot 1 of both the X3 and X4 programs is 0.065 ETH. This total amount will also cover the Ethereum "Gas fees"
Gas fees do not go into the Forsage platform, they are a seperate transaction charge which goes towards paying the Ethereum Miners.
This is a one time payment. Any future upgrades to higher levels of Forsage are entirely optional and can be funded from any earnings that you make from your Forsage team activity.