How to set up the micro-letter password protection? The technique of micro-letter secret security setting

1 as shown in the following image, we login to the micro-letter, and then click on the upper right corner of the "Settings" button, click to enter the image shown below.

2 and then in the Open Settings window, we find "account protection" under "My Account" and click it as shown in the following figure

3 OK now we are in the "Account Protection" We can click "Binding mobile Phone number" in the Open new page we click "Next", and then you will find the following interface

Note that if the phone is lost or the number is changed, we can only go to the official complaint oh.