How to change input pin of FreqCounter Arduino Uno/Dumilanove library? The following link to the library defines arduino pin 5 for input pin for signal. 
 https://www.pjrc.com/teensy/td_libs_FreqCount.html

But the problem is I'm using an 16x2 LCD display with the arduino pin 5. The display needs pin 5 to work. So the question can solved in two ways,to both of which I don't know the answer.
1. Change LCD pin number to other pin. (Tried it was a failure. I've probably done it wrong)
2. Change the input pin for the freqcount library.

Any idea how to get past this bottleneck?
The library makes use of the hardware peripheral Timer 1 which has its input on pin 5 of the Uno.

It can't be changed.  You have no choice in that.

You will have to move the LCD to another pin instead.