If it's a Boolean field (Yes/No, True/False) then you won't be able to render the value of this field using Personalization. Instead, click the "If" icon (Conditionals).
  1. Click "If" in the WYSIWYG Editor
  2. Click Additional Information
  3. Click the name of your Boolean field
  4. Select true or false
  5. Click Insert
The selection of true or false will determine what should be displayed depending on the field's value. For example, if you selected true, then you can enter the text that will display if the value is true and enter the text to display if it's not true (false or blank). Vise-versa, if you selected false, then you'll enter the text to display if the value is false and what text to display if the value is not false (true or blank).