how to do it?

Hi nose.matani,

This article gives good information about how to connect your MacBook Air to the Internet -

Mac Basics: Connecting your Mac to the Internet

http://support.apple.com/kb/HT2497

If you have more specific questions about this or are having issues with some of the steps, please post back and I will continue helping you.

Thanks for using Apple Support Communities.

Best,

Brett L