Hello,
First you need to make sure the printer itself is already connected to the same Wifi the computer is connected to. That part needs to be done on the printer itself via the printer's menu/ LCD screen. I wouldn't be able to advise you how to do that as it is strictly Epson's instruction, not Microsoft/Windows related. Typically you find the network section in the menu and you should find option to connect to Wifi.
Once the above is done, on the computer side, you want to download the following driver from Epson's official website for your model. Once downloaded, install it. It should then install the printer for your Windows.