First of all, you must register a Baidu account, and the account must be signed for 3 months before it can be opened. On the personal dynamic page of iTieba, in the directory navigation on the right, there is "Personal Settings". Enter "Personal Settings" and you can add a signature file in the signature file settings.

Note: Currently, the image link of the signature file is only applicable to the link of Baidu Tieba and Baidu Space image.