Connecting via WiFi an Epson printer

[tequilasunrise]

this is my problem:
I have installed the Epson software for my SX430W inkjet printer on a Windows 7 Pc.
During the installation, the software is asking if you want the connection made by wire (USB) or WiFi.
I said by USB. Everything is working fine.
Then, weeks later, I wanted to try WiFi.
Using the LCD Panel I made the WiFi connection with the WiFi Wizard. The process ended successfully and printed a report where everything were "passed".
But at the time of printing (without USB cable) pops up an error message "Not ready";
the Pc is still expecting the USB cable. My desktop Pc doens't have WiFi capability, but the modem - router does.
What should I change for make the printer working on WiFi?

 

[tequilasunrise]

SOLVED:
(it could seem simple but isn't explained in the epson manual)
1- start / devices and printers
2- Add a printer
3- Add a network, wireless or Bluetooth printer
4- Select the wireless printer from the list (it could be the same with different names)
5-be sure you are connected with internet
6-click next and wait for windows searching the proper driver on the web
note: some pop-up error could appear, but at the end the process will be successful.
Remember that since now you have not 1 but 2 printers connected, and you'll have to choose which one to use to print (usb or wifi)