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"1. Open File Explorer by swiping in from the right edge of the screen, tapping Search (or if you're using a mouse, pointing to the upper-right corner of the screen, moving the mouse pointer down, and then clicking Search), entering File Explorer in the search box, and then tapping or clicking File Explorer.
2. Browse to the item, select it, and then tap or click the Share tab.
3. Choose an option in the Share with group. There are different Share with options depending on whether your PC is connected to a network and what kind of network it is.
To share a file or folder with a particular person, choose that person's account.
To share with all the members of your homegroup, choose one of the Homegroup options. To select folders to share with all the members of your homegroup, swipe in from the right edge of the screen, tap Settings, and then tap Change PC settings. (If you're using a mouse, point to the lower-right corner of the screen, move the mouse pointer up, click Settings, and then click Change PC settings.) Tap or click Network, and then tap or click HomeGroup.
If the options in the Share with group are unavailable, it could be that we don't recommend sharing the location you selected. If you need to share a location such as a drive or system folder, tap or click Advanced security." http://windows.microsoft.com/en-us/windows-8/share-files-folders