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It`s actually really simple to set up the Wi-Fi on a Mac computer. If it`s your first time than you should already be set since it`s part of the installation process, but if not I`ll show you how to. Check the steps below and hopefully this will help you out!
1. Go to system preferences by either your dock or clicking on the Apple logo on the top left and going there.
2. Make sure you`re at Wi-Fi on the left hand side and click assist me, than assistant.
3. Select your Wi-Fi network name and enter your password, make sure you double click your network name though.
4. After clicking OK you should see a Congratulations screen, just click OK to dismiss it and your connected!
Hope this helped! If not just comment below and I`ll get back to you!
Image Source: I took it