Enter your own I post bar, and there is a personal setting on the right. Click to view basic information, signature file settings, etc. Click signature file settings to enter the signature file settings interface.

Upload the required picture to Baidu space, and then click on the picture. There is a copy picture address at the bottom right of the picture. Click to return to the signature file setting interface, click to add a set of signature files, paste the address you just copied, and then wait for Baidu's review.