@max-c I think what needs to happen is have the Fibo paint onto your chart, open the data window (Ctrl+D) then look for what output buffers give what for data. if the 61.8 on the fib outputs the charts price, you will need to use a condition block to find what price you want on what Fib line then write a formula block to get that price/level stored into a Variable. Once price is in a variable, you can have a condition block react when price contacts the level. I hope this helps.
PS - Output buffers start with 0, 1, 2, 3 etc etc.