Customize the Incident Template - Future Edits?

Customize the Incident Template - Future Edits?

I must be missing something, but when I go in and edit the default incident template, I've added some new fields. One of those fields is a list, so I put in a few items on that list when I initially setup up the new field box. All that worked great. However, now I want to change/edit the list of items and add and/or take some options away. I'm not seeing a way to edit the new field box I put into the template. What am I missing?

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