The clock icon in the bottom right corner and under the Pattern Library list locate the pattern you want to delete and swipe to the left and click the trash can to delete or Rename to edit the name.
Go to clock icon in the bottom right corner and under Pattern Library locate the pattern you want to delete and swipe to the left and click the trash can to delete.
If you would like to edit the name of the existing pattern, you can choose the RE-NAME under these same steps.