Time shift

Hi all,
hope someone can help me with this problem, I'm supposed to perform a time shift for my signal however it does not work..
I have an original signal which I need to do a time shift using DFT (Discrete Fourier Transform)
I had used 1D fourier interpolation.vi  to do DFT but 'm not too sure whether this is the right .VI to use. If it is, is there any better .VIs which I can use?
Can someone please help me with this problem, having a time shift by using DFT.
Thanks a lot in advance!!
Attachments:
Fourier Properties Part 2.vi ‏41 KB

Hi all,
May I know how can I do a simple discrete time fourier transform first? Can amend the program which I had sent out earlier for me to compare at least I know what I had done wrong. I've tried writing a formula manually, used the Interpolate 1D fourier and FFT.vi(s) but it just seems that I'm wrong everytime.
What I understand is, by applying fourier transform signal, I should be getting a frequency response graph. I did get a frequency response graph earlier, however when I calculate it with respect to the values I'd set to perform the operation, it's wrong again.
Please find attached my revised program and your superb advises, a million thank you in advance.
Attachments:
Fourier Properties Part 3.vi ‏38 KB

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