Enabling Shared Folder Feature in Virtual Box

To be able to share a folder from host to guest VMs, you need to install Guest Additions. To install it, click on Devices menu and then Install Guest Additions... And then the setup files will be mounted to the CD-ROM drive of the guest OS. Suppose your guest OS is Windows 8 (32 bit) so you can double click on the file VBoxWindowsAddition-x86.exe to install it. After the installation has finished, you'll see your shared folder appear as a new drive if you already configured it.

Please note that if you click on Install Guest Additions... and then nothing happens, it's probably because of your virtual CD-ROM drive is already being mounted to something else. If it is, you should unmount it first.

To unmount it:
1. Go to the settings of the OS guest and click Storage
2. Select the mounted file under the virtual CD-ROM drive for example, Controller IDE.
3. Click on the disc symbol next to CD/DVD Drive combobox and then Remove disk from virtual drive