The steps of setting the second password on the electronic tax platform are as follows:

1. Log on to the e-tax platform and enter the individual user center or enterprise user center.

2. Find options such as "Security Settings" or "Password Management" in the individual user center or enterprise user center, and click to enter.

3. Find options such as "Second Password" or "Transaction Password" and click "Settings".

4. Fill in relevant information as required, including password setting, password confirmation and password protection.

5. Save the settings and complete the setting of the second password.