1. First, download and open the word document, and position the cursor where you need to add a bookmark. Click Insert, and then click Bookmark. Pop-up bookmark dialog box.

2. Enter the signature of the book in the input box and click the "Add" button. Click Insert Bookmark, and then click Locate. This operation is currently limited to the computer version of word documents, and the mobile version of word documents does not support bookmark display function for the time being.