Yes, if you plan to stay in Finland for more than 3 months, you must register your place of residence with DVV (Digital and Population Data Services Agency).
Yes, if you plan to stay in Finland for more than 3 months, you must register your place of residence with DVV (Digital and Population Data Services Agency). You can do it online at dvv.fi using Suomi.fi identification, or in person at a DVV service point.
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When registering, you will need your address, passport, and if you are a non-EU citizen, your residence permit. The registration is free. After this, your address will be in the national population register and authorities will send official mail to this address.