RBRE960 - how to block websites for a certain period of time, each day

I have the RBRE960, activated parent controls today to try them out but I can't find what I'm trying to do:

Block youtube.com, Mon-Fri, from 9am-12pm, across entire network.

On the app, I can't see how to do that specific request.

On the router login, I can do that but I have other blocked sites there that I want to run 24/7. I only see the option to leave it as is - blocked 24/7 or create a schedule that will apply to all blocked sites, which I don't want to do.

Appreciate any help!