epson sx 235w wireless settings. Help appreciated

[#1]

Wireless HP Laptop via Thomson (plusnet) router all works good.  Printer works via usb only.  Googled the problem and it appears I have to make sure the ssid is correct.  I really don't have enough knowledge to find how to change it. I would prefer to throw it out of the window at the moment.
Any helpful suggestions to find a cure would be appreciated.  Best wishes.

[#2]

All it is asking is for you to enter the "Key" password which you put into your computer to connect your wifi with.
As found on card supplied from Plus Net
If not work give us a shout back.... Otherwise have a good one

[#3]

It was pilot error. Now fixed by uninstall & reinstall and following the instructions properly.  Thank-you