When you create a new topic, there are no reviewers in the list. To insert the reviewer insert a new topic and click on accept. In the lower part of the screen you will see the part for the reviewer.
You can enter a new reviewer for this topic by clicking on ‘New Reviewer’. The ‘Reviewer Data’ screen, shown below, is displayed.
Click on Accept when you have insert all the data. In the next screen you will see the reviewer that you have insert for the topic.