In your message threads, an Automated Message Campaign SMS is easily identified by the title (gold box in image below) as well as the gear icon (turquoise box in image below).
Underneath the message are three options: Send Now, Edit, and Delete.
Two are kind of obvious, right?
But we want to speak about Edit.
If you click on Edit, you will be directed to the actual campaign page to edit the WHOLE campaign. This is not what you want.
To edit the AMC for just one person
Step 1: Under "People", find the person you want to make changes for, and then go to that person's message tab:
Or, if you are in the "Messages" page and already viewing their message history in the inbox:
Step 2: Copy the scheduled AMC message that you want to edit
Step 3: Click on the message box to show more options.
Step 4: Choose "Delete" to delete the scheduled AMC message.
Step 5: Paste the copied AMC message in the text box, make any edits you would like (my edits are shown in blue squares below), then schedule your new message for whatever date / time it needs to go out on. Click Schedule to schedule this message.
This new scheduled message will now take the place of the deleted AMC message for that person.
What if you need to edit the campaign for everyone? For example, you need to edit date, time or add new message(s)?
Check out this help desk article: http://help.pastorsline.com/en/articles/3334078-v3-what-happens-when-i-edit-an-existing-automated-messages-campaign-amc-that-has-active-contacts