To change the order that a timer appears on your home screen, tap and hold a timer, then drag it to the desired position. Hours TimeLord will automatically remember the way you last ordered your timers, and allow that order to persist in the app until you change it.
You can also choose to alphabetize your timer by going to Settings from your bottom navigation bar, selecting 'Timers and Reports', then toggling on 'Alphabetize timer list' under the 'Time List' section. Remember, if you have alphabetize timer list selected, the system will automatically order your timers for you but you will not be able to manually change that order unless this setting is turned off.