Butterworth filter and FFT filter

[Carvalho10]

I am using filter PtByPt and my VI is attached above. Error is that the icon does not connect to my other block. To also wanting a graph that transforms the time domain to the frequency domain. How do I?

[HollyBerry]

Which icon is not connecting to which block? Do you have a broken wire? What does the broken wire message say when you hover over it? What errors is LabVIEW notifying you about? 

Here is a great discussion about how to transfomr the time domain to the frequency domain in a waveform graph:

http://forums.ni.com/t5/LabVIEW/How-to-change-the-waveform-graph-from-time-domain-to-frequency/td-p/...