How far ahead each reminder goes out, and on what.
Each rule is a length of notice and a channel. Add as many as you need; each one sends its own message.
A rule can be switched off without deleting it, which is the easier thing to undo if you are only pausing.
With no enabled rules, no reminders are sent at all. The screen says so rather than leaving you to work it out.
Did this leave something out? Email support@kuai.io.