No, on the screen that controls which fields you see when creating/editing and viewing an issue. Here is the documentation for it https://confluence.atlassian.com/adminjiraserver075/defining-a-screen-935391284.html
You need admin rights in order to modify a screen.
No (although they probably would be useful there too)
You need the field to be on the issue screens. Go to the project, then admin, then work your way down the "issue type screen scheme" to identify which screens are in use, and add the field to them.
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