To add or remove product associated with a class, follow these steps:
1. In the Classes Overview screen, click the Manage Classes spanner icon.
2. You are now in the Class Detail screen for that class. Click the blue spanner icon to open the Manage Products
3. Use the blue drop down arrow to expand each product, then select the grey icon next to any title to associate it with the class. Select the red icon to remove a title from a class. Select Save when complete.