How do I find out what my username and password is for my wireless network

My printer works through the wireless network, but my scanner doesn't recognize my computer.  I'm thinking I have a username/password issues.

I don't think that its user name and password issue .
As you Printer is working fine with your wireless network that means the router is communicating with the Printer .
For the Scanner check the settings on your printer itself for the Scanner function .

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