Questions: 
1. What's the default password
2. How to rename the Wi-Fi signal name
3. How to change the Wi-Fi password
4. How to reset the password
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Question: Couldn't find the Wi-Fi signal
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Questions:
1. I lost the USB, how can I get the files?
2. I changed a new computer, where to find the set up files? 
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Questions:
1. The sign shows random blocks
2. The sign shows incomplete message
3. The message doesn't show in the right color
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Question: The sign doesn't show anything
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Questions:
1. How to use timer switch
2. The sign turns off at wrong time
3. How to correct the clock of the sign
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