While we are more than willing to help those that are stuck, that doesn't mean that we are here to do it all for you! We can't do all the work, you are either getting paid for this, or it's part of your grades and it wouldn't be at all fair for us to do it all for you.
So we need you to do the work, and we will help you when you get stuck. That doesn't mean we will give you a step by step solution you can hand in!
Start by explaining where you are at the moment, and what the next step in the process is. Then tell us what you have tried to get that next step working, and what happened when you did.
If you are having problems getting started at all, then this may help: How to Write Code to Solve a Problem, A Beginner's Guide
Then think about it: how would you do it manually? If you can travese forward and backward, why can't you identify a mirror point?
Write down an example:
How would you find a mirror point in that?
You'd take the first element and look at one before and one after. Are they the same? is not, ignore it and try the second.
If they are, look at eteh ones two away, and so on.
If you get back to your original element, it's a mirror point
Give it a try: it's not complicated