| 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." | |