Jira Administration - custom fields

We use JIRA here at work. 

For logging bugs we have users fill out a form for a defect and then submit.

To edit those forms we need Administrative privileges and when you get to the form in question there are fields and custom fields.

Some fields just update the Field label and you actually need to click on the left side on Custom fields for some fields that use pulldown menus (e.g. versions for a product).

Maybe less than intuitive but for some JIRA form edits you need to look at the custom fields screen.