Hi bewan,
I'm not quite following you, but to get Activity and About Me and the other tabs, you need to add the Profile System.
Click on the MyNetwork download centre at the top of this page, then hit the blue box on the right (Getting Started). This gives a brief description of how MyNetwork works. Then, continue to download and click the Profile System tab - add Profile System Core and any other features you want and download it.
The rest is just uploading the files and following the Support & FAQ for each feature. If you need a hand, feel free to start a new thread here with your problem!