We have pre-installed most of them for you and they are ready to use.
To see the list of applications, go to Application --> Browse
To edit it, go to Application --> Edit. Here, you will be able to:
1. find out what are these applications for
2. setting each of the application based on your preferences
3. set the arrangement of applications by dragging it (ctrl + drag up or down).
4. adjust the privacy setting of each application
5. remove the application that you do not want to use
At the moment the only removable application is Twitter but we will be adding more applications for you to use soon.