The follower rewards control what commands, if any, are reward to users when they follow your channel for the first time.
To enable follower rewards you must toggle them on.
You can see if follower rewards are currently enabled by the overlay icons in the navigation menu and window title bar. When enabled the overlay icon is shown, e.g.
When disabled, the icon will be used instead.
The general tab of the follower reward screen controls what if anything is rewarded when you get a new follower.
The notification tab of the follower reward screen controls what if anything is sent to chat when you get a new follower.