There was an email a long time about that. In the marvel app they moved archived books under the quick link, arrow icon upper left. The archived books is under the Settings link.

I archived some Marvel comic in the Marvel app but you can only un archive through Comixology. At one time you could do it on marvel.com.

There is no archiving anymore. That got removed in Feb. any books that were archived in the old app were automatically added to your library. What are you trying to do exactly?

Please some one tell me how to unarchive comics, I have searched for over 45 minutes on the website and cannot find it.

Unarchiving