We trust you have read the starter's advice in the section Admissions of this site - that will answer many of your questions.
If you wish to contact the Study in Finland team, you can send us email to the following address:
sif@oph.fi
If you have questions regarding your application, or if you need to ask about entrance exam or tuition fee matters, you should contact the Admissions Services of the Finnish university/UAS you're applying to.
You can find the contact details of the universities' Admissions Services for example on the Studyinfo.fi website.