To clean up the messy data, it needs to be loaded into the Power Query Editor.

Microsoft Excel makes it easy to import data from other sources, such as Access and Oracle databases. Doing so, however, may result in poorly formatted data that is difficult to analyze, sort or ...

The first thing to do here is to open your file within Excel. If the app is already opened, simply go to File > Open. Alternatively, you can locate the Excel file from File Explorer, then right-click, ...