Otherwise, you will need to add a button to the menu.
1. Go to Manager / Configuration / Menus
2. Select the menu screen you wish to modify
3. Click on an available button space on the matrix. The button set up area will appear on your right.
4. Choose button type = Offer
5. For Offer set up, browse and select the coupon you just added.
6. Modify the name, color, button size, graphic, etc.
7. Press OK
8. Press Update Now to save your changes.