How to install Ubuntu on empty disk space along side Win7?

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http://askubuntu.com – I have a computer that is partitioned between Ubuntu 12.04 and Windows 7. Long story short, I wanted to make a fresh install of 12.10, so I copied all of my personal data from 12.04 over to my Win7 partition, the deleted the partition that had 12.04 on it: What I want to do now is install Ubuntu 12.10 on all of the empty disk space. Thus I open the installer, and I am presented with the option to install over the entire HDD, or "Something Else". I click on something else, and I am presented with this window: How do I use this window to install Ubuntu 12.10 over the rest of the unallocat (HowTos)