How to Set Account Details on WordPress.com
It is always a good idea to be familiar with your account details. In this section, you manage WordPress.com account items such as your username, password, e-mail, and website URL.
Username: Your WordPress username is displayed here. Click the Change link to change your username.
E-Mail: Your e-mail address is displayed here. You can leave it as is or change it whenever you want.
Website: The URL address for your WordPress blog is displayed here; you can change it if you want. This is the link that’s attached to your name throughout your blog, such as when you leave comments.
New Password: When you want to change the password for your blog, type your new password in the text box.
Directly below the New Password text box is a link called Learn about Choosing Great Passwords. Read this article for tips and ideas for setting a strong password for your WordPress.com account to make sure your data is secure, protected, and cannot be accessed by anyone but you.
Change your password frequently. Some people on the Internet make it their business to hijack blogs for their own malicious purposes. If you change your password monthly, you lower your risk by keeping the hackers guessing.
When you finish setting all the options on the Personal Settings page, don’t forget to click the Save Changes button to save your changes.