Question 687116
You have the right idea, but you need to flip things around a bit


1. E   (given)
2. E v S  (addition)
3. S v E  (commutation)
4. ~~S v E (double negation)
5. ~S -> E (material implication)


Optionally, you can also do


1. E   (given)
2. E v ~S  (addition)
3. ~S v E  (commutation)
4. ~S v E (double negation)
5. S -> E (material implication)


So basically, the antecedent is whatever you want it to be because you can add on anything you want (in line 2)