People often confuse tire (just the rubber/plastic treaded part) with wheel (the entire assembly, including rim and hub). In either case why not just Google your question Remove rear (wheel/tire) Huffy Green Machine? Lots of videos and posts to choose from.

I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881

Need more info please.
Are you trying to remove back tyres off a car?