All that is left is to replace the printhead cartridge carrier tray ensuring you push against the white label (Image 1 orange arrow) until it clicks under the grey sprung catch (Image 1 red) and then replace the cartridges (Image 2) as normal ensuring they also click into place

You can now move the assembly all the way to the right to park it

Close the printer lid

Restore power and test it moves at the request of the printer during start up sequence