To add an exercise to your module simply click on the "Exercise" button highlighted in the next image.
Next, type in the name of the exercise you'd like to add from the list. Or use the Filter located in the top right hand corner.
Repeat until you've selected all the exercises you'd like to add to your module click the "Add x Exercises" button located at the bottom of the screen to add them to your module.
That's it! You've added exercises to your module! If you've forgotten to add something just repeat the steps above.