May I volunteer a how to? But your friend may prefer to wait for the Grand Master Of All Things Cover Picture Related.
Tell your friend to start a thread, write lots about cake (tell her to tag myself - I wish to know all about cake), then click post. Your friend should then have a 'cover' button on her posted thread. She needs to click on that. Tell your friend I haven't tried this myself, and that it might in fact turn on her oven remotely.