how can i disable two stage ID

If necessary, there is a contact link.

Apple ID Support

Apple ID Support (2)

Apple Support by e-mail or chat Select your device, Battery, Power and Charging, then Power adapter not working to get a chat option. If you need to talk to them, ask them if they will do a Skype or FaceTime with you.

Apple Support using Twitter

I am guessing you are referring to two factor authentication? If so, the only way to turn it off is to log into AppleID.com and under security there is a button to turn off two factor. The thing is though, you will need to use the two factor to sign in. A code will be sent to a trusted device. If you are not getting the code to a trusted device, you can get it sent to a trust phone number by selecting “didn’t get code” and will send the code to the phone number associated with the account or aka “trusted phone number”.

Two-factor authentication for Apple ID - Apple Support