Create a project in the Project Browser. You will be prompted for a short codename, a long name and a client. The codename is the actual ID of the project. Long name and client are used in reports.
Open your project and you can see more deails and parameters such as default materials. Below you find an empty list of structures.
Structures are created with a form similar to that of the projects.
Open your structure and you will see structure details and an empty list of solved connections. It's time to solve your first connection: