Hi,

One of my friends bought Mac recently. He asked me help him to connect his Mac to ADSL internet connection. But I can't.
Could you please let me know every stage of that?

Thanks

Regards,
Sharron

Go to System Preferences, click on Network. Click on the Assist me... button and it should lead you through the process. Here's an Apple support article that should be helpful:

Mac OS X: Connecting to the Internet via cable, DSL, or local area network (LAN)

Note that if your friend's ISP requires PPoE, you need to follow these instructions first:

Mac OS X: Connecting to the Internet with PPPoE

Thanks for your help.

Regards,