Hi, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.Initially, have you tried going through the motion of installing the ink cartridges?
Yes please. Actually its more on initiating mechanical action of allowing the ink cartridge mount/holder to slide out.
Perhaps the video HERE may shed insight.
Then that would be the issue as it should automatically slide out to expose the slots where the ink cartridges may be installed.
Can you please try "manually assisting" the ink cartridge mount to slide from the right towards the middle?