In your watchlist you will find a menu item "Share" on the right above the watchlist. By clicking on this menu item, a pop-up window will show you a public link to the watchlist, which you can copy and share. Recipients can only see the contents of your watchlist via the link. However, they cannot access your account. To play the content, recipients must each sign in with their own account. If you want to deactivate the public link again, then also click on the "Share" menu item. In the pop-up window, you can deactivate the link by clicking the "Stop sharing" button.