You'll need an app before you can update it. If you need help creating an app, check out this detailed article.
Navigate to "Apps" section using the left-hand navigation pane.
Select the app that you intend to update.
Click on the "Edit app settings" button to modify its settings.
Modify the fields according to your preferences
Then click on "Save App Settings" to apply the changes.
Need to know how to delete an app? Check out this article for more details.