3D FDTD using FDTD in CST(Computer Simulation Technology)

Hey
I am using CST for 3D FDTD simulation. I can do 2D and 1D in C or matlab code but with 3D code becomes complicated hence I want to shift to CST. I understand that CST microwave studio can do the job for me. I just want 5x5x5 m 3D space and take a gaussian source somewhere within this space. I want to visualize how the E or H field is changing with respect to time.( This I was able to do in 1D and 2D case in Matlab). Can anyone point me in the right direction? How to begin?
Thanks in advance

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