To access your Hostinger Horizons solution, go to your hPanel and click on Websites > Websites List in the left-hand navigation menu:
After that, you’ll see the Add Website button on the right side. Click on it and select Horizons:
And that's it! The Horizons solution will open and you will be able to get started with Horizons.
If you would like to access an already created webapp done with Horizons, you can do so by going to your hPanel and click on Websites > Websites List in the left-hand navigation menu and then on Edit website: