Help > Authoring > Using Markup > Inserting Markup
  
Inserting Markup
To insert markup:
1. Click the Insert Markup toolbar button. The Insert Markup dialog box opens.
2. Select an element from the list, and click OK.
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It is recommended that you not leave empty elements in your documents. Empty elements are elements that contain no content. Empty elements may cause undesirable formatting. This is particularly true of elements that contain generated text, spacing, punctuation, and graphics. If you want to use elements as placeholders in your document, include some content in them, even if it is just a word or a couple of identifying characters like TBD or xxx.