How to allow installation of Non-Market apps (ICS)?

I'm attempting to install the exynos fix after downloading the .apk file. When I open the file to run, the system tells me that I cannot install apps that did not originate from Google Play. After some googling I found an article that shows a workaround , however when I go to: Home → Settings → Applications I see a list of applications and memory usage. It's the same window I see if I go to: Home → Settings → Storage → Applications Ergo, I am not finding where I can tick Unknown Sources. ## How do I access the actual Application Settings shown below?