Please, do yourself and everyone else a favor and stop using My Japanese Coach... it's a terrible resource to learn from. The stroke order on a few of the kana is wrong... also, it teaches poor grammar skills as I noticed when after a month or two of learning from it, I tried talking to a friend and he said my Japanese was terrible. You're much better off with a book like Genki... which is what I'm learning from right now. I could send you the e-book if you want, or you can buy it here...

Amazon.com: genki

There are two books and two workbooks.

I wouldn't get rid of My Japanese Coach entirely. While I have heard that it is a poor resource for grammar, it can be a good source for vocab. Of course vocab is just as important as grammar, so another study source is good.

To be fair, the concept of population had never been in Asia (China, Korea, Japan) because it started as a 19th century Western concept. This reflects some sheer awkwardness with the kanji translation.