Why can't i change the setting at the security

Why can't i change the setting at the security & privacy? After I switch to OS X Yosemite, i cant install some application. It says that I can install due unidentified developers. Can anyone help?

You can change the setting, you may need to click the lock at the bottom of the preference pane. Be careful what you download and install, Gatekeeper is there to help you. OS X: About Gatekeeper - Apple Support

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