It's no accident what the default is. Making it simpler is not recommended for security reasons and really unnecessary. Most wifi devices have a way of remembering your preferred (default) wifi network ssid and password.
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My password problem is that it has a + and I have to sign into my Roku account. There is no + that I can find on the Roku screen for the plus sign. So I would like to change my password by just one letter. How do I do that?