To add a Data Source to a project, you need to be assigned the 'Project Admin' role.
A Pipeline source represents a source control repository (such as GitHub or Bitbucket) where Pipelines definition files can be found. A Pipeline source connects to the repository through an integration. Once a pipeline source is added, Pipelines will automatically load all config files from the repository that matches the specified filename filter. For more information, see Managing Pipelines Integrations.
Select the required project from the All Projects list in the taskbar.
Under Project Settings | Pipelines | Pipelines Sources, click Add Pipeline Source.
For more information, see Adding Pipeline Source.