Click on the plus sign on the right side of the row or apps. A fold will open from the bottom of the screen that shows two rows of apps. You can click down to see the other apps that are installed.
To remove an app find the app that you want to remove. It will have a green check mark. Click on the app to remove the check mark. Press the back button and the app will be removed.
To add an app find the app you want to add. Click on the app and make sure the green check mark appears. Press the back button and the app will be added.
Note – You can only have 10 apps shown on the bottom row of apps. If you try to add more than 10 you will get a pop up telling that there is no space for the app.