1. First, open the online electronic tax bureau, click Login, and select the registration below. 2. According to the prompt, fill in the mobile phone number, set the password, enter the verification code received on the mobile phone, and click Next. 3. Fill in the taxpayer's name and ID number, and click Next to complete the registration. 4. Return to the login page, click the user name to log in, enter the mobile phone number and password, and log in with the verification code. 5. After entering, the prompt message of real-name authentication will pop up. Click for real-name authentication, and you can choose bank card authentication or WeChat authentication, and enter information as needed. 6. After the authentication is completed, click the name in the upper right corner and select Modify Password. 7. Select Identity Management in the navigation bar on the left, then click Add, insert the tax disc or CA certificate, and enter the password for verification. 8. After the verification is completed, click the name in the upper right corner, select Switch Identity, and select the enterprise to declare tax.