Thanks Dustin - I'll have to regroup and see what I did wrong as I tried that and the system didn't save the exercise.  But I know me and am sure it's simply "user error".

+1 for this one.

My original question:

I note there is an area where you list other exercises.  Can any of these be put into the workout section that I am currently using…to replace an exercise in this predetermined section?  For example, there is some literature which suggests leg curls may not be all that functional - that in fact the Romanian Deadlifts is more useful.  I’m not claiming to be the expert here, I’m more interested in knowing if we can replace a certain exercise in the “Choose your workout” section with an exercise from the “Choose your exercise” section.