its very simple.
1) Just zip your extension and copy it on to the server desktop.
2) open QMC and open the extensions tab.
3) import your extension by specifying the file path of the zipped file.
You are done.
What this would do in the background is, it will unzip the extension and add it to the QlikSense Extension repository.
Hope this solves your issue.
- Sangram Reddy.