In the bottom right corner you can see the netlify call out. To see it again just refresh.
To see it on other sites simply drag this link into your bookmarks bar; Netlify All The Things! Then when you are on the site you can just click it and the call out will show.
Please note that the call out stays on a desktop, but goes away after the initial animation on mobile phones.
If you do not wish the call out on your page, you can simply upgrade to a paid plan.