To get internet at your SiÅs flat you will have to register your computer at:
Follow the instructions at the registration.
Fill inn your mac address when you get to this point. If you do not know how to find your mac address, you can follow the guide below.
How to find mac address on Mac OS X
1. Click on the network icon at the top right corner of your desktop. Then choose “open network preferences”
2. Choose the “Ethernet” collum at the left side, then choose “advanced”
3. Choose the hardware tile at top and then you should see your mac address.