email notifications plus closure of my account

I am not sure how I got onto this platform.
Having received an email notification out of the blue I logged in and see that all email notifications on my account are set to 'None'  - how then did I receive the one that came in this morning?
Also, I can see no means to delete my account - surely this is a prerequisite in this day and age? 
If I cannot delete my account for myself then there should be details of how to go about requesting a deletion. 
Please explain the process.
Thank you