Hi! On the Assembled Bundle version, the MMU is already connected to the printer.
If you are building the kit version, or attaching an assembled unit, you might want to visit this another guide: https://help.prusa3d.com/guide/10a-mk4-s-mk3-9-s-setup-and-calibration_426826#685398
If you are building the kit version, or attaching an assembled unit, you might want to visit this another guide:
https://help.prusa3d.com/guide/10a-mk4-s-mk3-9-s-setup-and-calibration_426826#685398