Front page products can be added or removed by navigating to Website > Design > Front Page Products > Add Front Page Products > Finding the category of the product and then selecting the checkbox corresponding to that product. Be sure to hit Save!
Or directly on the product page itself using the setting Can be used for Front Page.
Once you've added products to the Front Page, you can turn them on/off with the checkbox that corresponds to that product. To choose the order the products display, set values in the Order field from highest to lowest. The highest value will appear first on the Front Page and so on in descending order.