All reviews on a manuscript must be entered into the  online journal system. In order to accept or reject this request you will need to login to the online journal system. A login username and password should have been sent in a separate email. If you can not access this, you can reset your password from the review invitation email. A new username and password will be sent to your email address.

You can see the Reviewing process in the below video links.

1. YouTube 

2. aparat