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Go to "System Preferences" -> "Network". You'll get a screen similar to the following one:

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On the left, select "AirPort".
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Click on "Advanced...", then click the "Proxies" header.
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Check the box for "Web Proxy (HTTP)" and enter "192.168.49.1", and "8282".
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Do the same for "Secure Web Proxy (HTTPS)".

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Click "OK" to save and close the proxy settings, then click "Apply" to save and close the Network properties.