This may be simple, but I am having little trouble.

I designed a digital filter from the digital filter specs given. I estimated the digital filter spec it to analog filter by bilinear transformation and calculated the order. Then I mapped backed to digital filter by bilinear process again. Now I have one 1st order and three 2nd second order low pass filters. I cascaded them and can see the frequency response. But I have not been able to use it to filter a signal. Also I want to convert it to a high pass filter. How can I do that?

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