First, you need to login to your Power BI Service,
In another workspace (not My workspace) you able to create dataflow.
to create a new workspace, click on the Workspaces-> Create app workspace
Now, in the new page, you will see a page that able us to create a new workspace (pro or premium)
To do that, click on the Try Now.
A new page will be open, that allows you to create a new workspace with image, name and description
choose proper image, name, and description and click on the Save.
In the new page, you able to see your new workspace and the welcome page, just skip the welcome page to navigate to the main workspace page.
In the main workspace page, beside dataset, Dashboard, Reports, we have new feature name as Dataflows, click on Create option at the top right the page and choose the Dataflow.
it navigates to a page that asking you about adding entities (data source) click on the define new entities.
In the next page, you able to connect to different resources from cloud to on-premises. For this example, we just put some manual data to check the cognitive service (Text Analytics),
Click on the Blank Table, then change the title of the column to Comments, put the below text for each row ( row by row). then put a name for the table and click on the Next.
