linux - How to install centos inside virtual box using iso image

I am using oracle virtual box manager

I created the virtual hard disk

In Setting -> System -> Boot order

selected CD/DVD-ROM has the first priority

And in storage I did this changes

while starting installtion its giving this error

What is the mistake here ?

Base system : Centos 6.2

Answer

Don't worry about adding the CD into the virtual machine, if it's a new virtual machine when you first power it on it will run the first run wizard and ask you if you want to install an OS and it will then let you choose the CD / ISO.

You can also use the removable devices options in the Virtual Machines menu.