ESP32 Matter device

So I’ve been following Matter (BETA) - Home Assistant and flashed the matter light switch onto my ESP32-C3-DevKitM-1.
After Commissioning it with the HA, it showed in my device and entity list.
How can I link this switch with a light in my network?
Also how does the Button work? Does the “BOOT”-Button work as the input? If so, why does my console in Matter Example Apps not show any changes when I press it.
Can anyone help me with this? I haven’t been able to find any more documentation on this.

Thanks in advance!