New modem and now offline

Hey guys,
It has been a few years since I set-up my brewpi. I just got a new cable modem at my house and now my brewpi is off-line. I can’t remember how to access the wifi settings. Anyone know of a quick easy fix to get back online?

For the Spark: Hold the setup button until it flashes blue. Then use the Particle phone app to enter new WiFi credentials.

For the pi, follow this guide:

If you installed a while ago, you might have used hypriot os. This is not recommended anymore.