1. First, click the "Yuandao Jingwei Camera" icon in the mobile phone to enter the application.

2. Click the "Settings" icon in the lower right corner of the page.

3. Click the "Watermark Signature" option in the list item to enter.

4. On the "Parameter Settings" page, manually enter your mobile phone number and sign on the blackboard below.

5. Click "Save Signature" in the upper right corner. If you are not satisfied, you can click Clear or Return on the left to modify it.