Coding sell/buy via P&F trend / please helps

#1
Dear all Brothers!

I want to make a simple filter system but I dont know about coding. Please kindly helps me. My ideal for system as below:
When P & F trend value change from -1 to 1 it mean a buy signal
When P & F trend value change from 1 to -1 it mean a sell signal

Many many thanks for your helps
 

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