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And to answer the question - right click on any field that you normally can see as field for typing numbers or text. Or directly type the name of the Constant/Variable (if it is without blank spaces or starting with digit)[/quote:3pn99lgv]
ok I understand how to define the variables correctly..
my example it's:
I have to put in a variable called "FRUP" the price level when there is formed a fractal up (indicator build in) ..
first, i define a variable "FRUP" in option "project variable", and assign numeric value = 0
how can I with the formula block to enter the price level in "FRUP" variable, when I have a fractal signal UP?
This passage is difficult to understand..
Sorry for my eng.. 
Activemax..