I have light room 5.7. When I go to presets to delete a preset I don't see how it's done. I would think there would be a simple preset button. Keith

I understand you are looking for the Metadata presets to apply at Import- (and delete some)

In Lr, Open the Preferences dialog (Ctrl+,), select the Presets Tab, click on the button [Show Lightroom Presets Folder]

Expand the 'Lightroom' Folder, then expand the 'Metadata' folder.

The default location for the Metadata folder in a PC will be like:

C:\Users\Your Name\AppData\Roaming\Adobe\Lightroom\Metadata Presets

Delete the presets from this folder.

Restart Lr.