There are multiple ways to delete a note. Go to the folders tree view and select the folder where the note is located. All the notes for this folder will be displayed on list the situated on the right side of the folders tree.
Then you can do the following:
1. Right click on the note that you want to delete and choose the Delete option from the displayed popup menu.
or,
2. Click on the note that you want to delete and then click the Delete button on the toolbar (this is the fourth button on the toolbar)
or,
3. Click on the note that you want to delete and then go to File menu and choose the Delete Item option.
or,
4. Click on the note that you want to delete and then go to the Notes menu and choose the Delete option.
The selected Note will be deleted from the database.