Finnish higher education institutions offer a range of scholarship options for those non-EU/EEA students who are required to pay tuition fees.
Each university/UAS has its own scholarship system, so the kinds of scholarship available and any tuition fees you are expected to cover will depend on the institution and the degree programme. You usually apply for the scholarship from the university at the same time when you apply for admission.
So, your first step would be to search for the degree programme you'd be interested in applying to. Then, you can check the scholarship options and procedures with the university offering that programme.
Remember that in addition to tuition fees, you are also expected to cover your living expenses.