To permanently remove AuthoredUp extension, follow these steps:
1. Open manage extensions screen in Chrome. On Windows and Linux, you can achieve this through Chrome menu. On Mac-os, the option is available in top menu.
2. Find AuthoredUp in the list of extensions, and click Remove.
Alternatively, you can also right click the AuthoredUp icon in the extensions bar and click "Remove from Chrome".
After you do this, make sure to reload your LinkedIn tab to remove all traces AuthoredUp from LinkedIn.