I need help on how to add unallocated space to my /dev/sdb3 partition [SOLVED]

[ProudlyTM]

As the title says, I need to get this unallocated space added to my "/dev/sdb3" partition. Could use some help!

Picture of my partition table: http://i.imgur.com/3jS3bvC.jpg

P.S.: I've made the partitions manually, as I use Ubuntu as my secondary OS (Windows 7 is my first OS, on a separate hard disk). I boot to Ubuntu when I choose this hard disk from my motherboard's boot menu.

 

[ProudlyTM]

Update: Got it working by deleting the swap partition, extending the /dev/sdb3 partition and then adding again the swap partition and then finally, clicking on Swapon.