There should be some button or picture that looks like an attenae at least sort of on the front of the printer. Or look at the printer instructions.
Push that button and it should walk you through the network name, security type and password. If you can get thru that the printer should show up in the list of printers when you try to print
But you say you couldnt get your phone to connect and you pushed the easy setup button. I havent had to deal with that for a while and I dont have window pcs for years so Im kind of hazy on details.
Youll need to figure out what the current settings are on the wifi router. You might be able to bring up a web page using 192.168.1.1 as the url. That is instead of putting democraticunderground.com into the browser put that ip address in on the pc that is able to connect. That ip address is pretty standard for routers. If that doesnt work try 10.0.0.1.
If that works you can set the network name and password. If you can just display the password just do that and write it down.
If you cant display the password you can set it but if you do warned the pc will no longer be able to connect until you go to network settings and put the new name/password in. The security should be something like wpa2. On mac i would click the wireless thing on the top right of screen. I think windows has something similar
Once you know the password you should be able to connect your phone to be sure. The phone is just easier to deal with than standing by the printer typing on a small screen. Once youve practiced on your phone push that attenae button on the printer display and do the steps it should walk you through.
Sorry thats not very simple. This is the type of thing that I would flail at for an hour or so until i got it right. I havent had to deal with it for a few years now.