Information about the rules, procedures and fees for filing an appeal are found at the Court of Appeals Self-Help Center.
The Law Library also has resources to help you through the appeal process, including:
Filing a Pro Se Appeal of a Family Court Case in the Minnesota Appellate Court: A booklet about filing an appeal for people who are not represented by a lawyer (Minnesota Battered Women's Project, 2005). It has detailed instructions plus examples of filled-out forms and letters.