There are two ways to access Edit Mode of a Buncee.
1. To edit a Buncee you are previewing, simply click on the 'Edit' button on the top right of your canvas to go into Edit Mode.
2. To edit a Buncee when you are in the Buncee Dashboard, either click on the Buncee, or click on the 3-dots on the top right corner of the Buncee, then click 'Edit'.