Add to Chrome.
Click 'Add extension' above.
The installation process should take less than a minute.
Next, you'll Create an Account.
How do I delete Notes in LastPass Wallet?
In the Notes list, slide your finger across the row you wish to delete. That will show the delete button. Press it to delete the note. To cancel, just tap anywhere that is not that row.
To delete an attachment, use the same technique in the attachment list when editing a note.