Editing VirtualBox Installation with Centos 7 (section)

==== Step 7:  Addition VirtualBox Guest Additions CD Image ====

Along the top menu bar (Mac OSX), or along the top of the guest VM window,
there should be a tab called "Devices".  Within this pull down menu, choose to
insert the Guest Additions CD image.  This image has a script that will allow
to compile a set of kernel modules that, when loaded into the kernel, will fix
a lot of annoyances (like the mouse capture issue, and being able to resize
the VM window size, among other things).  You should see the VirtualBox Guest
Additions CD on your Desktop if this was successful.

Now, double-click on the VirtualBoxGuestAdditions CD image on the Desktop, and
then choose to "Run Software".  This should ask you for your password, and
then compile the modules.  Yippee!!!