How do I change security preferences to let me install an HP printer driver? Won't let me because not an "identified developer".

Downloaded a printer driver from HP website for a p1102w laser printer. When I try to run the install package, I get a pop-up telling me that only App Store and "identified developers" application are allowed dur to my security preferences. When I try to change in System Preferences, the option to change is grayed out.
Printer not working, Printer proxy displays no window. At an impasse...

Welcome to the Apple Support Communities
Right-click this file and select Open. You can also go to System Preferences > Security and Privacy and select Anywhere in Allow applications downloaded from. See > http://support.apple.com/kb/HT5290

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