Insert the checkboxes where you want them and delete the text that is with the checkbox. Click on the properties button and link the check box to the cell under the checkbox. Select the cell under the checkbox and format the font to be white so that text will not show. Where you want the message if checked enter a formula such as this.
This example assumes the checkbox is in B2 and the cell linked to the checkbox is B2. Where you want the response if checked enter this formula which will enter your text when the checkbox is checked and a blank cell if not checked. Replace the "" with text between the " " for the checkbox being unchecked if you need that:
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