Hello Juna,
If you are unable to see the printer's SSID when you perform the wireless setup, I would suggest checking your router settings to make sure the wifi network is not set to 5ghz only. The printer would need 2.4 ghz turned on to work. If you are unable to ping the printer's IP address from your Mac via ethernet, You can try resetting the printer's settings and then setting the printer for the ethernet connection again.
If you continue to have issues, I would suggest contacting support at 1-800-652-2666. Our agents would be happy to help.
