You can enter characters and symbols by using on-screen keyboard when you enter network and other settings.

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Indicates the character count. |
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Moves the cursor to the input position. |
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Switches between upper case and lower case. |
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Switches the character type. ABC: Letters 123#: Numbers and symbols |
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Enters frequently used email domain addresses or URLs. |
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Enters a space. |
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Saves entered characters. |
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Deletes the character to the left. Deletes the character to the right when the cursor is at the start of the line and there are no characters to the left. |