All applications launched in OpenShift run inside projects that can be created by any authenticated user. Each project has its own private virtual network and is isolated from other projects. Users can only see those projects that they've created themselves or that have been shared with them. Any containers, volumes and other resources created by users are always created inside a project.
You can either select applications to run from the application catalog that is visible when first logging in or launch any applications that you like using the primitives described in the background chapter.
Using the web interface
After logging in, you should proceed to create a project in which to run your application(s).