How do I delete capital one shopping help ? It says go to preferences in safari!

To open Preferences in Safari, go to the menu named "SafarI" (between the Apple menu and the File menu) and click on Preferences.

Also see the following from https://capitaloneshopping.com/help

 Safari:

1. Open Safari.
2. Click the "Safari" button on the taskbar at the top of your Mac's screen, then click Preferences from the Safari menu.
3. Once the Preferences menu is open, click the Extensions tab.
4. Click the Capital One Shopping extension from the list.
5. Click the Uninstall button.