After changing the password on your router, you must delete, reset, and re-pair the Snap to your account again.
Here is a link showing how to reset the camera: https://support.sengled.com/hc/en-us/articles/218424918-How-do-I-reset-Snap-
For a step-by-step guide on how to set the camera up, please see our tutorials:
Installing a Smart LED with Security Camera (Snap): https://support.sengled.com/hc/en-us/articles/360020525533-Installing-a-Smart-LED-with-Security-Camera-Snap-
Installing a Smart LED with Security Camera G2 (Snap 2): https://support.sengled.com/hc/en-us/articles/360020524433-Installing-a-Smart-LED-with-Security-Camera-G2-Snap-2-