If you'd like to learn about administration procedures, an introduction to the code base, and see the full test protocol, visit the App Store Wiki page: http://wiki.cytoscape.org/AppStore
Note that the App Store can also be deployed as a Docker container. To find out more, visit: https://github.com/cytoscape/appstore/wiki. (This setup is likely stale, and is not supported.)
If you'd like to go to the App Store bug tracker, visit the Cytoscape Redmine page: https://code.cytoscape.org/redmine/projects/cytoscape3