i own an iohone, purchased on 19 Sept 2011

how do i download ios6?

 

I have some email messages which I'm certain I have not deleted.  I have checked deleted messages which they do not appear i.  So where could they be and how do I access them.  The emails are from the period of the 10th to the 20th Sept.
What is wrong with this picture? Cannot get answers to what is wrong. How do I access answers to these questions?