PHP Virtual box Console Greyed out or Disabled

open cmd and type these command

1 VBoxManage modifyvm Machine name --vrdeport 3389-4000

2 VBoxManage modifyvm Machine name --vrde on 

start virtual machine from PHP interface and then click on console

click on connect

Now Ready to use with console 

Note: Virtual box Extension Pack must be installed on Virtual box for extension pack downloading 

Please visit virtual box official site. download extension pack follow these step