Hi Linc. I'm Greg, a volunteer and 8 year WIndows MVP here to help you.
Go to Settings>Apps>Default Apps and change IE to Chrome. This should do it.
If not you may need to dig into the App's settings to see if there's a way to change it? We can help better if you tell us what app it is.
I hope this helps. Feel free to ask back any questions and let us know how it goes. I will keep working with you until it's resolved.