How to remove your MyOpenID account
General remark: the tricky part of logins used on multiple sites is that they mostly all have their own ToS/PP, so removing an open account may not mean removing everything submitted to the sites you used that account for. In those cases it may be really worthwhile to actually read the ToS/PP, for a change.
Be logged in, use the removal link. As you will see, there is a choice (checkbox) between deactivation and removal. Pretty neat.
Direct removal link: https://www.myopenid.com/delete
Helpful Trick: Removing online data
Helpful Trick: Remove third-party logins
If you signed up for MyOpenID using a third-party login such as Facebook or Twitter, you probably want to revoke all access from MyOpenID. Click here to find out how.