01) Access the Control Panel
02) After login click Configuration >> Categories and Subcategories Settings >> Show / Hide Box Categories Index >> Click on the EDIT button
True = Enable
False = Disable
03) After clicking the UPDATE button
04) To appear on the main page you need to insert images in the main categories.
Click Catalog >> select the main category and click the EDIT button.
In the 4th image field insert upload an image.
The ideal size is maximum width of 300pixel and minimum of 150pixel.
Using different sizes will effect a differentiated effect on the home page.