1. Open the main interface of the Electronic Taxation Bureau and click on the registration item under the matter handling window. 2. Many options will pop up, select the change registration option and click the handle button. 3. At this time, you can click on the tax payer’s name under the change item. 4. The original username will pop up under the next step of changing registration items. In this way, fill in the current username to change the username for the tax bureau’s real-name authentication.