To create a new memoboard in Notezilla, launch the Notes Browser and choose File / New Memoboard from the Notes Browser menu.
To create a memoboard inside an existing memoboard, right-click on a memoboard item in the Memoboards pane and choose 'New memoboard' from the menu.
To delete a memoboard, right-click on the memoboard item in the Memoboards pane and choose 'Delete' from the menu. The memoboard then moved to the Trash.