Do I have to be diagnosed to mark "yes" on a Voluntary Self-Identification of Disability Form?

It's in the title. I think I suffer from depression and/or anxiety, but have never been formally evaluated. I just want to know if I'd be breaking a rule by answering "yes"

And while I'm here, the name I'm supposed to put on the form is my legal name, correct? Full legal name? or just first and last?

EDIT: Italicized the word "think"

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