The first step is to select the Trigger type. There are four trigger types:
1. Campaign Trigger: This trigger sends a response to messages that have the matching keyword
2. Campaign Trigger - Catch All: This trigger sends a response to all messages
3. Opt-out Trigger: This trigger sends a Opt-out link to messages that have the matching keyword
4. Opt-out Trigger - Catch All: This trigger sends a Opt-out link to all messages.