The mobile phone client can't set the signature file. You need to open Baidu Post Bar in your computer browser to set it.

1, the browser opens the post bar to log in.

2. Move the mouse to the gear and click Post Bar Settings in the pop-up menu.

3. After entering, switch the label to the signature file settings, and click Add a set of signature files.

4. Fill in the name and picture address in the pop-up window, and then save it. After the post bar is approved, the signature file can be displayed.

5. The signed file cannot upload pictures locally. You can choose one from Baidu Album-Public Album, click the copy link, and fill in the picture address where the signature file is needed.