So I just started trying to spice up my first short video my friends and I made but I don't seem to understand how to chose when a effect comes in and out. I see the sliders for it saying "effect in" and "effect out" but I just don't get what it means. I want an effect to come in 50 seconds into the clip and end 54 seconds into the clip but when I type it in it says "Invalid Time-code". Any help would be appreciated.