You can first start off by asking questions here in the forums. We will gladly help
[I emphasize this word help, because most people tend to think that help = doing their work. Here at MHF, we want to help people by leading them in the right direction on a question they are having trouble with. We aren't here to do their homework. So when you post a question, we would appreciate it if you showed us your attempt first. I don't think one would learn anything, unless they try to do it themselves first ]
What class is this for? I would also recommend looking for a tutor as an additional resource.
I've heard success stories about people who used MHF that were worried about their grade, and ended up passing their class with either B's or A's.
So you can be one of these successes if you put effort into this.
Just remember we will help you along the way whenever you need it.