You need the Dashboard Designer Role, to create dashboards.
To create a new dashboard, click Add in the Dashboard Repository.
After that the New... page is opened. Here you can set a dashboard name, add the alias of the FlexPart that will be created with the Dashboard, create a new data source or connect to an existing data source.
To learn how to provide data for the created dashboard, see Providing Data.
To learn how to specify Roles required to access the dashboard, see Configure Role-Based Access.