You can find buttons and hooks in the Attachments panel by clicking Edit Attachments.
To add a button or hook, select a tooth first, then click on a button or hook in the Attachments/BITE STOP, BUTTON, HOOK section.
To edit a button or hook, you should select it first, and then adjust the position of its control points.
To remove a button or hook, select the tooth with the button or hook, then click the button or hook selected in the Attachments/BITE STOP, BUTTON, HOOK section.