How do I use guest browsing on my Acer Chromebook?
Guest browsing can be used to share your Chromebook with friends and family. The guest browsing feature lets people privately browse the web on your Chromebook even if they don't have a Google Account. So you can safely lend your Chromebook to your friends without giving them access to all your personal emails and files.
For information on how to enable and disable guest browsing, visit Google's Guest browsing page.
For more information, visit the Chrome OS Help Center.