The steps to set the signature file of the post bar are as follows:

1. Put the mouse on the setting icon as shown in the figure, and click the post bar setting in the drop-down bar.

2. Then click the signature file setting.

3. Then click the option to add a set of signature files.

4. Never mind the form just opened, let's find the target webpage picture first. Select properties.

5. Copy the address information of the picture.

6. Paste it into the picture link option in the form of creating a signature file. Enter a name and click Save.

7. After the signature file is created, wait patiently for approval.