1. Open the WPS text, and insert "bookmark" and book signature before the paragraph corresponding to the table of contents title.

2. After inserting the bookmark, select the title content in the bookmark option and insert the hyperlink.

3. After inserting the hyperlink, open the Insert Hyperlink dialog box.

4. Finally, select "Location in this document" for "Link to", click the book signature in the right box and confirm. At this point, the text link under the directory is set.