Do you mean on export import settings? Or you are asking how to instal SEO by Yooast?
Best way to see what is your wp wersion is to go to Upgrades menu 9under home) and on the top you will find this f.e.
WordPress Updates
Last checked on May 12, 2013 at 12:09 am. Check Again
You have the latest version of WordPress. (in this example latest means 3.5.1)