Barbara; I would suggest emailing Jason Davis [email protected]. He is very knowledgeable about the site.
If you are on the main Workout Builder page (www.ideafit.com/exercise-library), you will see a blue panel on the right titled My Workouts. If you click on any of the images or titles in that panel you will be taken to the workout edit page.
From there you can change the title, description, order of the exercises and define exercise detail (sets, reps, etc).
I hope this helps.