Yamaha 15hp help

[Mofal]

Hi to all in forum , first of all i wanna sorry for my bad english ..
I own yamaha f15amh 2013 whit electrik start but cant start it because no have cables on it, last owner took them off because they was installed on hes boat .
I wanna put cables + - from battery to starter . I need to know how to put 2 buttons for start and off motor . Someone can tell me how to do it ?

 

[Mofal]

 

[Tegweni]

Bridge yellow and red to one side of a push button switch ,on the other side of the push button switch connect brown if you push the button the starter motor will turn over ,take your finger off the button once it starts .to switch it off you need another push button switch one side connect black on the other side connect white push the button and the motor will stop.