You can use Wi-Fi as an alternative to an ethernet cable when establishing an internet connection. It is, though, recommended to use an ethernet cable for a more stable connection and therefore better quality.
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Highlight Settings.
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Press the Centre key.
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Highlight Network.
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Press the Centre key.
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Highlight Wi-Fi.
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Press the Centre key.
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Highlight the required Wi-Fi network.
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Press the Centre key.
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Key in the password for the Wi-Fi network and highlight Continue.