Press the plus sign at the bottom right of the home screen. You will see all of the apps you have on your box. Click on the apps you want on the home screen. You will see a green check mark on the apps that are selected to be on the home screen.
To remove an app from being on the home screen, click on it and you will see the green check mark disappear.
Once you are completed, press the back button on the remote and you will see the shortcuts you selected are now on the bottom row of apps.