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This question already has an answer here:

I have an AT&T Galaxy S phone, but I can't find install from an unknown source. How can I install apps I receive?

marked as duplicate by ale, t0mm13b, eldarerathis Dec 8 '14 at 22:28

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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You need to download and install Android Central Sideload Wonder Machine to your computer and connect your device to the computer. This link will surely help you out. Just follow every step carefully and you will get rid of that issue. Hope that helps.

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