Show the Developer tab
1. To open the Word Options dialog box, do one of the following:
- On the File tab, click the Options button:
- Right-click in any tab (ribbon) and choose Customize the Ribbon... in the popup menu:
2. In the Word Options dialog box, on the Customize Ribbon tab, in the left column, check the Developer tab:

3. Click OK.
For more details, see Creating Your Own Menu.
See also this tip in French: Afficher l'onglet Développeur dans Word.