Shut down the VM client, and use set the VRDE property "VNCPassword":
Code: Select all
$ VBoxManage modifyvm "VM_NAME" --vrdeproperty VNCPassword=xxx
(VirtualBox version 4.3.10, on Ubuntu 14.04.3 LTS 64bit)
Jumping out of an airplane is not a basic instinct. Neither is breathing underwater. But put the two together and you're traveling through space!