Hi Siva,
In process design screen, in upper left menu you have "Corresponding Connector" button.
When you click on this, you will see a non-editable Connector that will kick that process.
You can make the exact same Connector yourself, and use it anywhere in your account to kick your process.
The authentication is configured in Provider.
If you use "RunMyProcess Secured Connection", it will assume user authentication from Process.
If you want to specify a user, use Basic authentication (login and password) of the user.
Best regards,
Taka