You can edit your picture or profile information in the Profile tab under your account settings or by clicking the "Edit profile" button that appears on your profile whenever you are logged in to that account.
To change the location, website, picture, or bio listed on your profile, follow these steps:
If you'd like to change your profile background image or theme, please read How to Customize Your Twitter Design.
Click here to troubleshoot profile photo uploading problems. If you can't update your settings, visit this page.