1. You need to install those two effect files to "Program Files\Construct 2\effects" folder. For example, C:\Program Files\Construct 2\effects.
2. Once installed, you can access the effects in event sheets. Go [System] -> (Under Layers and Layout) -> Look for entries that have purple FX icons.
Try downloading Alpha Threshold Effect and experiment with it.
Gmoney
Thanks for your reply. You misunderstood my question. I want to ask the way to create a fx effect, not run it
Sorry, my poor English is main cause for misunderstanding