How to create "push button " for import "extern" value ( for Expert Advisor)

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Hello

i created an EA, and there is some "extern" inputs value that used inside source, 

now i want use "Push Button" in the main chart, to change some "extern" values.

can every one help me please ?

thanks

 
You can't change inputs. You shouldn't change externs. Just open the EA's properties (F7.)
 
William Roeder:
You can't change inputs. You shouldn't change externs. Just open the EA's properties (F7.)

there is "extern" ,not "Input "

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