Alright, well, often times when dealing with probability problems, it's easier to find the probability of an event not happening, and work from there. If I'm interpreting your problem correctly, you've been tasked with finding the probability of getting at least one success in 5 trials with a 40% success rate. The only way to not get at least one success is to get 0 successes. So, what's the probability of that happening? What does that make the actual answer to your problem? Recall that the probability of an event happening is always 1 minus the probability of it not happening.
If you get stuck again, that's okay, but when you reply back, please include any and all work you've done on this problem, even the parts you know for sure are wrong. Thank you.