Adding a Field to a Screen
In order to edit fields in Structure, those fields must be added to the appropriate screens from your Jira settings.
To add a field to a screen:
Go to Settings | Work Items. (Note: You must have admin access)
In the left menu, select Fields.
Locate the field you want to be able to edit from Structure. Click the … on the far right and select Add field to screen.
Select the “Default Issue Screen” for any project within the structure (or select all screens, if you use this field in multiple structures).
Scroll to the bottom of the list and click Update.