I believe that when you submit a spell and it is rejected, you will get the option to delete it. Once a spell has been approved it is "in the system", and you lose control over it.
You can't delete spells from your spell list. These are the ones you have learned, and your character can use.
Also, 2 of the 3 spells which were awaiting approval had disappeared a few days ago without any notification!.
This means that a GM approved them for use. You may or may not have been granted one or more them for your own use.
