Hello,

What PC do you have? Windows or mac?

If Windows, you can try and download Samsung EWS, Easy Wireless Setup.

https://support.hp.com/us-en/drivers/selfservice/samsung-xpress-sl-c480-color-laser-multifunction-pr...

Click on Software, then choose Samsung Easy Wireless Setup. 

Download and install it on PC.

Then you search for Samsung Easy Wireless Setup >> Choose WiFi, and then you can choose Network and Type Password on PC instead. It's a wireless setup wizard basically.

If Mac then WPS might work? Press and hold WPS button on Printer for about 3 seconds, then on Router click on WPS button, wait 1 minute or 2, then the WiFi led should change from blinking light to a steady light,

Check and see if it works,