How do I enable Name, email address and website fields in comments?

How do I add the Name, Email Address and Website fields to comments? There are people asking how to remove these fields. One solution I saw is to download a plugin that will hide them. I think it’s strange that my problem is that the fields aren’t there and I want to display them. Does that mean that whether or not you see them depends on your theme? I’ve been through settings and theme options in the dashboard and I can’t figure it out. Thanks.

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