Set Up the In-App Message Button set-up-the-in-app-message-button
You can use the default button design, modify it, or upload your own custom button image.
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                  Click the button to open the Style tab for editing.   
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                  To change the color for the standard button, click the Color button.   
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                  Click the color selection square and select the button color by clicking it or entering it the Hex or RGB numbers on the color picker.   
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                  Select a shape in the drop-down. Standard shape choices include sharp corners, round corners, and gradients.   
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                  If you want to use your own image for a button, click the Image button, and click Select Image.   
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                  Choose the image and click Select.   note tip TIP When placing a custom image for the button, consider clearing the placeholder text laid over it if your image includes text already. 
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                  Click the color selection square and then select the font color by clicking it or entering Hex or RGB numbers on the color picker.   
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                  Click the arrows to choose the font size.   
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                  Choose font style for emphasis: Bold, Italic, or Underline.   
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                  Click the button text to edit it inline.   
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                  Check the box to set the button tap action.   
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                  Click the drop-down for each platform and select a tap action.   note note NOTE The button always has a tap action, so the Tap Action checkbox is automatically selected, with the default message “Dismiss Message”. 
Almost there. Your last step is to configure your in-app message background and dismiss button.