How do I do my fafsa? If my parents have never done their taxes and are undocumented immigrants.?

They’ve only done their taxes about a few times but none recently . I’m in the class of 2019 and I want to go to a good university but most scholarships are asking for fafsa and well I don’t know how to fill it out if my parents haven’t done their income taxes. Someone please help I’m at a lost .
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