<snip> I have not tried the second part as my PC skills are that that good, but good enough to be able to connect to WIFI.
If you did the first bit, you were in the right place to do the split. However you need to do this using a cable connection, as once you change the SSID you will loose wifi connection. So being cabled you can work without loosing connection and you can then connect the wifi devices to the new SSID's once finished.
If you are concerned with messing anything up, you can always do a factory reset as below;
Try a 60 second factory pinhole reset as below;
Remove any ethernet cables from the Hub and hold the pinhole reset switch for 60 seconds. Do NOT reboot the Hub, just let it do it's thing. Note you will need the passwords from the bottom of the Hub afterwards, so make sure they are legible.
Also try disabling the 5Ghz wifi temporarily and then try the printer. You can re-enable the 5Ghz when finished.
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