It's literally on the home page: https://neuters.de
What kind of browser are you using? Aside from the url ending "/about", the first thing I see on the page is a big bold heading that reads "About".
On a positive note, the next time you land on a similar page, you'll know two more methods of finding a solution:
1. Check the URL.
2. Check the footer.Going back to home page should be built in and easy. I had the same issue, mobile browsers don't even show uri properly or hide menu, so manually editing address is not exactly my first thought on how to navigate a web page.