Unfortunately, this feature is not available in the Marvel Comics App. If you have synced your Marvel account to a comiXology account, you can use the unarchive feature at www.comiXology.com. If you have not yet synced your accounts, head over to https://www.comixology.com/my-account/marvel-sync. For assistance, please contact comiXology at www.comixology.com/contact-us.