I've never done this before, and don't recall the exact name, so I'm having trouble searching for the feature in CP.

How do you enable a message that a user must read and agree to before venturing further into your forum?

I think it had something to do with agreeing to your terms?

I want to put a reminder out there to my community about something and I thought this would be a good way to do it.

Also, once you turn this on, can you simply turn it off after a certain amount of time without making everyone see this message way past when you want?