• The option to unpublish and republish issues is available on the Publication screen > Issues tab. 'Publish and 'Unpublish' buttons are adjacent to their relevant issues:
  

Unpublish

• Select 'Unpublish' next to the issue to be unpublished. A list of the versions of that issue will be displayed (eg iOS, Adroid, Web app)
• Ensure that the versions you wish to unpublish are selected and hit 'Unpublish'
  

Re-publish

• Select 'Publish' next to the issue to be re-published. A list of possible versions of that issue will be displayed (eg iOS, Adroid, Web app) with those already published selected.
• Ensure that the versions you wish to re-publish are selected, choose whether to display an update notification within the app (to make users aware of the update) and hit 'Publish'