If you want to change the password associated with your login for the stream sent to you by your agent, you can do it in two ways.
If you have forgotten your password:
Please have a look at this article - Forgot your password?
If you are able to log in and want to change your password:
Click on your account icon on the top right hand corner, and choose Account Settings.
On your account settings, click on Password.
From there, you can enter a new password, then click Save Password, and you should be all set.