Man
noun
The の particle makes it so the 人 belongs to the 男. Basically, this literally means "a man person" or "a person of man." It's a more polite way to say plain old man, though, so all you have to remember is that.
This word is actually two separate words combined with a particle. So, since you treat them like separate words, you read each of them with the kun'yomi readings (they are both single kanji words all alone). That being said, in level 4 you learned about the vocab readings for these separate words, so use that knowledge to remember the reading for this word as well.
田中先生は男の人です。
Tanaka sensei is a man.
男の人用のブーツは中々ありませんでした。
There were not many boots for men.
ロマンチックな男の人ってプロポーズでフラッシュモブやりがちよね。
A romantic man tends to do a flash mob when proposing.