Hi @Neub72,
A warm welcome here in the Roku community!
We're glad to assist you with your problem with the missing screw. We'd like to know more details so we can assist you further. Are you using a wired or wireless video doorbell? Where and when did you purchase the Roku Smart Home Video Doorbell? Please be advised that you can try to get replacement screws from where you purchased them or look for something similar in stores near you.
Kind regards,
Eunice
Eunice L.
Roku Community Moderator