Select a sticky note in Notezilla, right-click on its title/toolbar and choose 'Send To->Computer' from the menu. The following 'Computers' window will be displayed. To add/edit computers, click on the 'Manage Computers' button.
Now, click on the 'Add Computer' button and proceed with the steps shown to you.
Similarly, you can edit/delete computers, edit/delete groups from the 'Computers' window shown above.