How can i change my UPI id in paytm?

You cannot create a brand new UPI ID, but you can change your Primary UPI ID from the options Paytm gives you.

1. Open the Paytm App.
2. Go to 'UPI & Payment Settings'.
3. Tap the three dots next to your Primary UPI ID and select 'Change Primary UPI ID'.
4. Choose your preferred ID and confirm.