Step 1: Click on the triangle next to master and expand all the sections.
Step 2: Click on triangle next to site data to expand.
Step 3: Then you will see HOME PAGE BOXES. Expand that and you will see all six sections on your home page: the three boxes and the three lower text areas. Click on the one you wish to unpublish.
Step 4: Go to properties and select UNPUBLISH.
Step 5: If you want to republish, you can simple hit the PUBLISH button at the top of the page.
If you want to change the text of these boxes VIEW this video. About halfway through you will see how to get new text on the home page boxes.