Check Your System Preferences

To share files over a network, make sure a network is activated and that you have enabled "Personal File Sharing," explained below.

Check the Network Preferences

To activate the desired network:

1.	Open System Preferences, then choose "Network."
2.	In the "Network" window (below-left), choose "Network Port Configurations" from the "Show" pop-up menu.
3.	Check the box next to the network you want to use. If more than one network is checked, drag the preferred network to the top of the list.
4.	Click "Apply Now" to apply any changes you made.

Check the Sharing Preferences

To turn on Personal File Sharing:

1.	Open System Preferences, then choose "Sharing."
2.	In the "Sharing" window (below-right), click the "Services" tab, then check "Personal File Sharing."