How do I go about adding my cover to scrivener to be compile

How do I go about adding my cover to scrivener to be part of my compile for kindle? Also, how do I delete that default cover? The include with compile box is checked and greyed out so I cant uncheck it. Any help would be much appreciated!

Drag your chosen image into the binder (not the draft folder; the Research folder is a good place for it).
In the expanded compile window, there should be a “Cover” section when you choose “Compile for: Kindle”; select your image from the drop-down list.

You can get rid of the sample book cover image by deleting it just like you would any other file, which sends it to the project’s trash folder.

Thank you RobertDGuthrie! Now book has been submitted to KDP for publishing! With any luck it will be available tonight!