Look behind the scenes!
You can use Ctrl + Shift + I (on most standard browsers) in Windows to see the code that this page uses. For Mac, use Command + Option + I.
Once you get in (you can finally call yourself a “hacker” now), look for the three dots beside a line of HTML (HyperText Markup Language) code, and click it.
Once inside (continued)
Once clicked, choose “Edit as HTML” in the dropdown menu.
Now it should look like this:
Now you can change any text you like (it won't save on the server though, so it's not really hacking…).
Bonus! You can also change colors and other styling options in the side bar (shown on the right).