How do I change a crew credit for a person that is incorrect?

Hey there! I am trying to change a crew credit for a person, but even with the "edit button" above the crew category I can't seem to do it. It then takes me to the category when I click on edit. I then select correct/delete but I don't get the list of crew under that category to make any changes. I have tried everything but with no luck. I have a few credits that I need to change.

Thanks so much!