You can review and edit basic account information in Account Settings.
To go to Account Settings, click on your Gravatar in the upper right-hand corner of your admin bar.
Here is a direct link to Account Settings: https://wordpress.com/me/account
Your WordPress.com username must be unique. You can change your username by typing in a new one into the username field and following the instructions that appear. Your WordPress.com username will display next to any posts you make in the WordPress.com forums.
Required. You may change this, but note that email addresses cannot be shared among accounts. That is, one email address cannot be registered with multiple accounts. You will need to confirm by email when changing your email address.
Note: Although your email address will not be displayed publicly on WordPress.com, when you comment on any site while logged into your WordPress.com account, the e-mail address will be visible to the site’s owner/administrator.
Choose which blog you want to be your primary blog. If you only have one blog there will be no dropdown.
Not required. The full URL of your main website or blog. The Web Address will be the link used for your Public Display Name when you leave comments on WordPress.com sites or in the forums. Changing your Web Address will not affect the link on existing comments; it will only change the link for future comments you leave.
Turning this option on will enable an in-page translation tool where available. It can be used to help translate the WordPress.com interface.
It wouldn’t be any fun if we told you what this does. Just try it out for yourself and see what happens.
Instant Post Feedback
Check this option if you want to see instant post feedback when you publish new posts.
Remember: If you make any changes to your Account settings, be sure to click the Save Changes button at the bottom!