Hi Albo,
Thank you for contacting us and I'm sorry about the issue you are experiencing. Unfortunately, mSecure 5 for iOS and Mac do not currently have the ability to remove custom icons. However, this ability will be added in the near future. I'm sorry I don't have better news for you here.
Albo P.
(Yes, a low-priority request and if it’s already satisfied count me ignorant.) I have three or four cases in which I’ve uploaded faulty custom icons. I’d like to delete them. I don’t see how.