To start texting, you will need to add the Send SMS buttons to your page layouts.​
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The package comes with the buttons pre created for you on the following Standard Objects: Leads, Contacts, Cases. You can create the same buttons on Custom Objects as long as you have a Phone field available and populated.
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This example will show you how to add the button for a Case.
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Add Texting Buttons
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Step 1: Go to Object Manager
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Go to Setup.
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Click on Object Manager.
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Step 2: Search For The Case Object
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Search for the Case object.
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Click on it to bring up the Case Object configuration details.
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Step 3: Open A Case Page Layout
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Click on Page Layouts.
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Click on a page layout to add the button.
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Step 4: Add Send SMS Button
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Click on Mobile & Lightning Actions.
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Look for the Send SMS button and drag it to the Salesforce Mobile and Lighting Experience Actions.
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Save your page layout.
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Remember that it can take a few minutes before the button shows up on your Page Layout. Try hard refreshing (CTRL+F5) if it doesn't show up.
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Step 5: Confirm Button Placement
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Go to the Case with the right Page Layout and confirm that the button exists.