Anyone out there want to help me?

Hey there everyone! I was wondering if anyone out there could help me with editing. I am currently writing a story with a friend of mine and we keep getting reviews that the story is good but we have a lot of spelling and grammar errors. Would anyone be willing to help us edit our chapters or at least tell us how to fix what we are doing wrong? I know this sounds crazy but I want to get better so people will pay attention to the story and not the crazy errors we are making! Any help would be greatly appreciated:)