Short answer
You can change your password from the Account Settings screen without entering your current one.
Full explanation
To change your password:
Click Index Management in the left-hand navigation panel.
Select Account Settings from the menu.
Click Change on the right-hand side of the Password line.
Enter your new password in the New Password field.
Re-enter it in the Confirm New Password field.
Click Save changes to apply your new password immediately.
You will use the new password the next time you sign in.
Tips
Use at least 8 characters with a mix of letters, numbers, and symbols.
Avoid reusing passwords from other accounts.
If you forget your password, you can reset it from the sign-in page using the Forgot password link.