Unable to add workouts to "workout" app...

I have found several sets of directions in order to add "kickboxing" to my workout app. However, when i scroll down to the bottom of the app on my watch, i do not see an "add workouts" button. It simply ends, giving me the option to begin an "other" workout. I'd like to add kickboxing as an option to track. Is this possible? Is there a setting I need to change in order to view these other available workouts?