When you have some indicator, get "Levels tester (for indicators and more)" block and connect it with "Just pass". Select inside the indicator you want to test and on the chart you will see what values it gives to the EA. Knowing these values you can use them with Condition block. Or you can also try blocks from "Indicators" category - they should work for most indicators.
This exact indicator has two buffers (two lines) and I guess they can be accessed from the EA and used. They are simply two levels. The indicator also draws fibonacci, which is named "AutoFibo" and if it does not rename it while running, it can be used with this name as an object.