If you want to delete a record, after selecting it use the Main Frame's DELETE button
You will need to Save to File.
You also have a button (between Mass Update and Locate) to EMPTY completely the opened Table (careful with this feature as ALL THE DATA WILL BE ERASED)
A confirmation message will be displayed
You will NOT need to Save to File if you use this EMPTY Table button but of course if you delete only several records then a Save to File will be necessary.