How can I delete a memo?
To delete one memo simply swipe your finger from right to left on its name in the list of memos then press the "Delete" button that appears. If you have more than one memo to delete (and have the pro version or an active subscription) it might be faster to press the "Edit" button on top of the list of memos, then select the memos you want to delete by touching them, finally press the trashcan button in the toolbar at the bottom of the list of memos.
Note that by default deleted memos go in a trashcan. Memos in the trashcan will be deleted when the amount of free space on your device becomes too low. You can also delete memos in the trashcan by pressing the "+" button, then pressing "Import from trashcan", then pressing the "Empty" button.