The User Contributions module allows you to create content editing interface for site members. Using this interface, the web site visitors are able to create, edit and delete content, even if they are not editors and cannot access Kentico CMS Desk.
For the User Contributions module implementations, use the Contribution list and Edit contribution web part.
For more details and information about User Contributions please refer to the Module User Contributions (Wiki) chapter in Kentico CMS Developer's guide.