Hi John7801,
Please use the link below for the steps to connect your PIXMA TR4720 to your Wi-Fi:
Connecting Your Printer to a Wireless Network (Manual Connect) - TR4720
There are videos available on that page as well.
If you would only like to know how to switch between upper case, lower case and numbers, please use this link:
Enter Numbers, Letters, and Symbols - TR4720
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