What You Will Learn
Learn and understand how to modify and edit your current subscriber list.
Your Lists Will Need the Occasional Modification, and This Is Where You Will Make Those Edits
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First Click
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Then Select
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And Select
All your lists will have a config button 
Once you click that button, you will be able to edit which number you send your offers and campaigns from (if you have multiple), the name of the list, and whether the list is active or inactive.
Refer to How to Create and Import Recipient Lists if it is your first time creating or importing a list.
Refer to How to Create a New SMS to learn more about the details of creating a new SMS message to your recipient list.