Hello Juston, and welcome to Seven Forums.
Sorry, but as in the Warning at the top of the tutorial.
The Local Security Group Policy Editor will only be available in the Windows 7 Professional, Ultimate, and Enterpise editions. You will not have the Local Security Policy Editor available in the Windows 7 Starter and Home Premium editions.
I'm not sure how to resolve your issue, but you should repost this issue in the Network & Sharing
forum to see if you may get a solution hopefully soon.