There are some critical steps left out, and now I'm stuck without a clue how to proceed.
When I turn on the Virtual Machine (Android-x86) there is no obvious way to direct it to the Android-x86 ISO that was downloaded. When I turn on the machine, all I get is a "FATAL: No bootable medium found! System halted." error within the Oracle VM VirtualBox window.
Can you please direct how to point the Virtual Machine to the Android ISO?