Once you have created a user, your SOGo instance can be accessed directly via your prefered internet browser.
SOGo URLs always follow the same template: https://yoururl-tld.netcup-mail.de/SOGo/
Once you have set up a SOGo instance with your desired URL, you can simply access it via the web interface by going to the address found in your Customer Control Panel.
You will be directed to the Login Panel. Type in your credentials, making sure to include the domain and TLD (Top-Level Domain) as part of your username.
Having successfully logged in, you will be redirected to the SOGo webinterface. Here you can access everything SOGo has to offer including your emails, your calendars and your address books.