Helping with English
I am learning Italian via Duolingo, and many good people are helping me with understanding and corrections.
I would like to help people who are learning English, which is, of course, my native tongue.
How can I do that?
You can take the Italian to English course and post in the sentence discussion areas and forums. Of course though, you will mostly need to post in Italian so that people understand you clearly. Since you aren't fluent in Italian, that will probably be a big problem.
Off of Duolingo though, you can help people by correcting their sentences here: http://lang-8.com/