How do minors apply for an Australian tourist visa?

To apply for a tourist visa, you need to prepare relevant materials for an Australian tourist visa, because you are under 18 and your parents are not with you, so you need to provide:

Copies of ID cards of all unaccompanied parents;

Written signature authorization of all unaccompanied parents, indicating:

Allow children to travel to Australia

Approximate travel dates and days

Agree to single entry or multiple entry

Contact information of unaccompanied parents

If you go to Australia to find your cousin to take care of your daily life, you need to provide a statement of support signed by her. The visa may still be used. In fact, it all depends on your parents' financial situation and whether the materials prepared are complete.