Enabling Unknown Sources
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Open the device settings. Look for a gear icon in the notification shade, near the top left corner, and tap on it.
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Scroll down to the Security section and tap to open it.
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Scroll down to the entry labeled "Unknown Sources" and read the subtext because you should always read any and all subtext in a "security" section of settings.
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Read the pop-up box that tells you Google isn't responsible if you install apps from places they do not explicitly Trust and click OK to enable the setting.
