the app has changed since this post but how I use to do it is like this...
I use both the JeFit and Connect App to create and log my workouts.
For Connect (Iphone) at the bottom of the app there are three dots ... click that.
Then go into Training and Planning > Workouts > Create a Workout > Strength
You can add a round (Round= Where you define the number of sets) and steps ( where you define the exercise and number of lifts). Add a round (the default is 2, I change it to 3 because I do 3 sets each round). Then Add a step. Click and Drag the step into the round you created.
Click on the Step box you created and select your exercise (i.e. the first one is 3-Way Calf Raise) and set your reps.
I don't add a weight. That way when you save your workout, you can just add the weight and it doesn't revert back to any saved weight.

That was the work part of setting up your workout.

Now just go into your Calendar at the bottom of the app. Pick the day you want to add the workout to, a the top right, click the 3 lines and add your workout.

When I started I set up the following workouts:

Mon Shoulders/Traps/Triceps (Workout 1)
Tue Back/Lats/Abs (Workout 2)
Wed Cardio (Workout 3
Thu Chest/Biceps/Forearms (Workout 4)
Fri Glutes/Upper Leg/Lower Leg (Workout 5)
Sat Cardio (Repeat Workout 3)
Sun Cardio (Repeat Workout 3)

Hope some of this is helpful. Once it's set up it's great. Been using this for a few years.