Once you’ve been assigned a user name, you can’t change it without deleting it. But you can change the way your name presents publicly, in your profile settings. Your profile settings is also where your would change your password. Keep your website secure by using passwords that aren’t words and that incorporate none-text digits and also some cApiTal leTTers.
Take time to add a biography, link to a personal website or social media site, and add an avatar by using Gravatar.
Side note about deleting your user name: be cautious because if you fail to transfer your posts to another user, they will be thrown in the trash.