WLC CLI commands

I'm trying to change the VLAN ID of an interface using the CLI of my WLC, but the only options I found in the config guide were to delete the existing and then create a new VLAN interface. These are the commands to create a new one:

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config interface create "VLAN 81" 81

config interface address dynamic-interface "VLAN 81" 192.168.81.46 255.255.255.0 192.168.81.1

config interface port "VLAN 81"

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Lets say I already have interface "VLAN 81" created and mapped to port "VLAN 81", how can I change "VLAN 81" to "VLAN 90" using the CLI? I know it can be done with the GUI, but unfortunately I don't have access to it. Thanks in advance!