How to fit the dual extruder for Tevo tarantula 3D printer

Hallo, today I repaired my 3D printed Tevo tarantula so I used dual extruder. Thanks. Video where 3D printer damaged: https://www.youtube.com/watch?v=Ue2u5YvVGgo My other video: https://www.youtube.com/watch?v=onzOfG3FIuw&t=12s