What problem are you having?
You mean mining in a LAN with multiple computers? It's pretty simple. Just launch Shift with the options:
--rpc --rpcaddr [computer's local IP] --shiftbase [your shift account]
For example mine looks like:
shift-windows-amd64.exe --rpc --rpcaddr 192.168.0.5 --shiftbase 0x8ab5e9b6fbfe45c8403ea6b17c3cb95d661c8226 console
Then point your miners to that computer, e.g.
ethminer -G -F 192.168.0.5:53901 --farm-recheck 100
If Shift isn't syncing at all then a little firewall management and port forwarding might be in order depending on how tight your security is. Also make sure you're using the latest version and that your system time is accurate. I had an issue a while ago where my system clock got ahead and the client wouldn't sync.