Issues with hdd setup

Hi guys any chance of some more help, somehow my line has been deleted screen was black all of a sudden and when i go to usr>keys>newcamd.list normally my line is typed into there and another example line underneith its empty no txt in there and i cant figure out how to type it says not editable when i try to type. I searched online and found a guy said press right to add a new line but i dont see how to click right ? Ive tried the right arrows and nothing happens. Any help would be appreciated fight is saturday !
Or can anyone tell me how do i usemy backup image i created ? Do i just power off put usb in and it restores it ? Thanks
 
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