Virtual Box

Hi, I can’t seem to get my VM to work Virtual Box keeps saying: “No bootable medium found, system halted”. I can’t seem to fix this and I am wondering if you could help. Thanks!

This is because:

You haven’t installed an operating system, the virtual hard drive is blank, and there is no file loaded to boot from.
Or
You have not created a virtual hard disk and configured the virtual machine to use it.