new directory on LinuxMin 17.2
 

How do I put a new directory in Linux mint 17.2 e.g My Documents?

Welcome to the forum!

Start the file browser, make sure it's displaying your home directory and click on File, then Create folder.

Actually, you should have one. I looked in the manual
https://www.linuxmint.com/documentation.php
and you should have Documents, Downloads, Music, Pictures, Video...

PS Never create a folder or file name with a space in: sooner or later it causes trouble. The name rules are
1. start with a character or letter
2. use only characters, letters, or the symbols (not initiallly!) under-score, hyphen, or full point.