the best way would be to set up the network. Find out what your xbox's IP is, hook it up to the computer Via Crossover cable or hub/router. Then you would connect using FlashFXP on the computer using the login name: xbox password: xbox
But please find out what dashboard you are using. We could start from there.
You should try providing details for Us first, since not all xboxes are the same, expecially "soft-modded" ones.