How do I get a work permit and where do I get it signed?

My old school had them and you would take it to the office to get it signed after the employer filled it out. But now I go to online school (for reasons other than covid) so I don't know where I'm supposed to get one or get it signed. I don't have a computer or printer at home. I'm 16.

Edit: oops I just remembered I'm 17 now lol

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