How do I get a fee waiver for UC

Hello I am applying to UC’s right now and I am wondering how I go about getting that fee waiver for 4 schools. Im pretty sure I am eligible but I am wondering if there is something I need to do to get it

From the UC website:

Applying for a fee waiver

You can apply for a fee waiver within the online application and be notified immediately whether you have qualified. You will need to provide your family’s income and the number of people supported by that income.