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The other option..
Hi Jason, Is this what should I do or I totally misunderstood it? It does not work anyway.. Thanks..
I have learned shorter way to handle it.f[x_] := a x^2; Manipulate[Plot[#, {x, -2, 2}], {a, 0, 1}]&@f[x]
yes, it is second derivative. I dont why it shows that way. Also, in my code variable is t instead of x.. how can I copy and paste my code as it is orijinal?
@sean clarke,  format is file, but I can open them with either excel or notepad program
Thank you so much, that's really helped..