You can create a class in any of the following ways:
Use the Class tool in the diagram Palette
Select to access the List of Classes, and click the Add a Row tool
Right-click the model or package in the Browser, and select
Right-click an interface, and select Create Class from the contextual menu (this method allows you to inherit all the operations of the interface, including the getter and setter operations, creates a realization link between the class and the interface, and shows this link in the Realizes sub-tab of the Dependencies tab of the class property sheet).
For general information about creating objects, see the Objects chapter in the Core Features Guide.