How to fix this wireless network issue?

I just bought a Samsung Ultrabook series 7, model number NP740U3E, and it won't connect to my home Wi-Fi. It connects to my friends Wi-Fi but not mine. Other products work on my home Wi-Fi such as my iPhone and old laptop so I know the Wi-Fi works. I was told that it could have something to do with the GHz that my Wi-Fi runs on. Something like a change between 4 and 5GHz but I'm uneducated on that stuff. How can I fix this so my Ultrabook connects to my Wi-Fi?

And is your network running at 2.4 or 5 GHz?

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