In 1907 George F. Sherman and David Inglis won after a decade of fighting the adoption of Initiative and Referendum in Michigan. Both, Initiative and Referendum allow changes in law and Constitutional amendments by placing a proposal on the ballot for the electorate to vote.
So for Initiative fill out: yes. For Referendum fill out: yes.
For How to get a measure on the ballot, fill out: It is by collecting a specific number of valid signatures from citizen voters and by a petition propose it for the ballot.