[Rails] <<How do I mount virtual rails to Virtual Machine?>>

I installed virtual machine on my windows vista operating system and
am running linux ubuntu. Then i downloaded virtual rails. i created
a virtual hard disk as instructed called virtualrailz001.vdi.
whenever I try to run the virtual machine I get the following error.

Fatal: could not read from the boot medium. system halted

from what I read in tutorials im supposed to have the VM mount a
bootable ISO image to install the OS from. I cant figure out how to
mount an ISO image..I thought I was supposed to mount the vdi image
and how do I do this anyways I checked in the settings million times
and there is nothing that says MOUNT..

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