I want to create an app Account

You have an Apple ID. You used it to sign into the support community. Why do you need another ID? Having more than one ID can make things more confusing.

If you create/use a new Apple ID, you will lose access to some of your data and the purchases made with your existing Apple ID.

Apple ID - create a new.      

Apple ID – Create        

Apple ID - Could Not Create or Could Not Set Up iCloud message.