I received a new Apple Watch 5 and I would love to change my red move band. Please help!!

This link shows you how to set the Move goal (red circle) to what you want it to be: Use the Activity app on your Apple Watch - Apple Support

Received from whom? If you purchased from Apple, you have 14 days to return no questions asked. If purchased after November 15, the return period is extended to January 1. I'm not sure what a red Move band is, but if you are outside of the return period, you can purchase any watch bands that Apple has available.

See here: Change your Apple Watch band - Apple Support