An app isn't working. What should I do?

Please check if other apps are working. If they are up and running then probably the developers of your app are currently working on it or maybe they have decided to close it completely.

Usually when things like this happen app's developers inform users about it in the official community the link to which is available under the app. You should send all your questions and concerns to this group.
Your search for returned no results.
Try using other keywords, e.g.: "delete profile", "create chat".
Check your request for misprints.