Can't Change Management VLAN On Switch

I'm probably a huge dummy but I can't figure out how to change the management VLAN on an Aruba 1930 switch. The switch is at a remote site and I talked a non-technical person through connecting it for me.

You change the management VLAN under the "Setup Network" section, but if I apply that I lose connectivity to the web interface because the port wasn't changed to that VLAN.

You change the port VLAN under the "VLAN" section, but if I apply that I lose connectivity to the web interface because the management VLAN wasn't changed.

I can't change both at the same time through the web interface because the settings don't save once I move to another section without applying.

So I saved the config to a text file and changed both of those settings, uploaded that config to the switch and rebooted. Now I can't access the web interface or ping the address, though the switch is working and passing traffic through to other devices.

Surely I'm missing something, right?

Maybe the only solution is to get the person helping me at the site to move the network cable to another port after I update the management VLAN setting?