You can mail it in. See Filing for a Property Tax Refund. It states:
Complete and send us Form M1PR, Homestead Credit Refund (for Homeowners) and Renter's Property Tax Refund. If you are filing as a renter, include any Certificates of Rent Paid (CRPs) you received.
See the Form M1PR instructions for filing details.
@Mamaof13
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