Help

[nuglol]

Hey All, Im Needing Some Help. I Have A 2001 Mark 4 Vw Golf Automatic..........its Been A Gargage Now For 3weeks. The Problem Is Wen I Put It Into 'd' It Rev's But Doesnt Move Or Moves Very Very Little, The Same In Reverse. I Got The Brain On The Gear Box Checked And Its Bolloxed, I've Also Been Told Its Probably The Oil In The Gear Box Too.that Needs Changed.........how Do I Change The Oil Or Does It Need To Be Taken To A Vw Garage With Special Equipment.....

Any Help Would Be Much Appreciated,

Thanks In Advance