How to expand the storage memory on the Yún

Official Hardware Classic Yún
78

Any idea why I am getting this instead of the windows shown in this tutorial? http://www.arduino.cc/en/Tutorial/ExpandingYunDiskSpace

Here's what I get:

1782×696 129 KB

I am planning to install Node using opkg but I ran out of space so I came across this tutorial but it is not working either.
root@Arduino:~# opkg update
Downloading http://downloads.arduino.cc/openwrtyun/1/packages/Packages.gz.
Updated list of available packages in /var/opkg-lists/attitude_adjustment.
Downloading http://downloads.arduino.cc/openwrtyun/1/packages/Packages.sig.
Signature check passed.
root@Arduino:~# opkg install node
Installing node (v0.10.33-1) to root...
Collected errors:

  • verify_pkg_installable: Only have 2040kb available on filesystem /overlay, pkg node needs 3016
  • opkg_install_cmd: Cannot install package node.
    root@Arduino:~# df -h
    Filesystem Size Used Available Use% Mounted on
    rootfs 6.9M 4.9M 2.0M 71% /
    /dev/root 7.5M 7.5M 0 100% /rom
    tmpfs 29.8M 480.0K 29.4M 2% /tmp
    tmpfs 512.0K 0 512.0K 0% /dev
    /dev/mtdblock3 6.9M 4.9M 2.0M 71% /overlay
    overlayfs:/overlay 6.9M 4.9M 2.0M 71% /
    /dev/sda1 7.3G 46.8M 7.2G 1% /mnt/sda1

Any step-by-step commands that help me increase the step would be really great.
My MicroSD card is 8G.