# Install the packages required
yum update
yum install gcc kernel-devel make

reboot

# Click: Devices/Install Guest Additions...

# Mount the ISO image with the guest additions
mkdir /cdrom
mount /dev/cdrom /cdrom

# Install guest additions
/cdrom/VBoxLinuxAdditions.run

# Share a folder from the VirtualBox control panel, giving it a share name.
sudo usermod -aG vboxsf $(whoami)
ls  /media/sf_<share_name>


# You could always mount the directory yourself as well
mkdir ~/a_folder_name
mount -t vboxsf vb_share_name ~/a_folder_name