First, click on your name in the top-right corner and select My Profile:
Next, click the Edit button:
Edit or update any of the profile fields:
A few things to note:
- Your Twitter handle should be formatted with the "@" character at the beginning of your username, as shown above.
- You can set any of these fields to "Private" by clicking on the Private/Visible toggle.
Click Save button when you are done making changes.