Hello AHAMD13,
Welcome to Apple Support Communities!
If we understand your post correctly, Call Forwarding is not working on your phone and all you're getting is the spinning wheel when you try to set it up. We're happy to provide some information.
Have you tried restarting your phone since this started happening?
Restart your iPhone
Take a look at this article for help setting up Call Forwarding: Set up call forwarding and call waiting on iPhone
If you're still having an issue with Call Forwarding, we recommend contacting your service provider for Call forwarding is a cellular carrier feature. It is handled by the carriers equipment.
Thank you for using Apple Support Communities.
Take care!