How can I add the edit and delete buttons in KeePass 2.19?
You can't add buttons for Edit and Delete actions.
However there are convenient methods for accessing these actions. If you double-click on an entry's Title the Entry will open in Edit mode. If you right click on an entry, a context menu that allows you to delete the entry will appear. You can also edit the selected entry by pressing the Enter key, or Delete it by pressing the Del key. Finally both actions are accessible via the Edit menu.