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You can usually do this by swiping up from the bottom of the home screen, or by tapping the Apps icon (often 9 small squares or dots). It's at the top-right corner of the app drawer. If you want the apps to be ordered alphabetically by title, select Alphabetical order now. This should be the default option. This brings you back to the app drawer in a special editing mode. After moving your apps around, you may wind up with blank spaces and pages, which is okay because you can delete them. It's at the top-right corner of the screen. Now all empty pages and spaces will be removed from the app drawer. Your app drawer changes are now saved.
Open the App Drawer on your Galaxy. Tap . Select Custom order. Drag and drop app icons to new locations. Tap . Tap Clean up pages. Tap Apply.