You should be able to click on your name in the upper right corner, go to your Settings and then use the link to Close your Account on the next page.
Hello, I have retired and no longer want to be on this site.
I have tried to find the delete my account and profile but can't.
Please delete my account **edited for Community Guidelines**
Please confirm by sending me an email that this account and profile are
deleted from your databank/database.