Filing of appeals requires online submission in prescribed form with party details and separate appeals per person. Rule 18 mandates electronic filing on the GSTAT Portal in the prescribed Form, with a cause title identifying the Tribunal and impugned order, consecutively numbered paragraphs, and initial listing of each party's full name, parentage, GSTIN, description and address. Party names must be consecutively numbered and maintained, with sub-numbering for legal heirs upon a party's death. One appeal suffices against an appellate decision despite multiple underlying notices, except where separate Forms are required for multiple original orders or where the impugned order relates to different persons, in which case individual appeals must be filed.