The first step is to select the Trigger type. There are four option to choose from:
1. Campaign Trigger: This sends a response to messages that match a keyword.
2. Campaign Trigger - Catch All: This sends a response to all messages.
3. Opt-out Trigger: This opts out anyone who repiles with a matching keyword.
4. Opt-out Trigger - Catch All: This opts out anyone who replies.