Let's introduce you to editing reports in Power BI Desktop
As a user you might run into limitations in the online Power BI editor, and want to edit a report in Power BI Desktop. This is especially relevant, since some features are not available in the online editor (for instance, you can not add images to a report).
By editing in Power BI desktop you are, among other things, able to
Utilize all Power BI Desktop Features
Publish the report directly from Power BI Desktop
Though, there are some steps that are crucial to utilize this feature