Colors -> Map -> Color Exchange
- Create the icon you want to use for your own stamp and save it in any graphics format supported by Okular (as png)
- Click the Add button, select type Stamp and enter a name for your stamp.
- Enter the full path to your custom icon into the dropdown box in the Stamp Symbol group.
You can separe the fields by a comma: .g. “ORDER by author, date”
You need to have a relative symlink (like “../../folder/file” or “folder/folder/file”), not an absolute one /(like “/mnt/your-path/file”): this latter indeed is effectual only in your computer, not on decoder (or in whatever other device).
You must clear not the cache or cookies, but the browser history.