Hi @Mary Irion ,
You can go to project settings --> Issue types and select issue type which you want.
On right hand side , under create a field you can select type of custom field.
Please refer below document for more details.
but that creates a custom field. I want to add the Jira End Date field....
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Are you referring Due date ? If yes, you can check under PREVIOUSLY-CREATED FIELDS section. below CREATE A FIELD section.
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