After installing Zammad, open http://localhost:3000 with your browser and follow the installation wizard.
You can find further information about Zammad's configuration on our Admin-Documentation (for Zammad-Administration within the WebApp).
Basically you need to do the following things:
- Create an admin account
- Set your system basics like hostname and logo
- Connect channels like an email account
- Invite agents and customers to work with you in Zammad