The 'Review Templates' settings allow you to customise your reviews.
To access the settings, select 'Settings' on the menu bar at the top of the page, then select 'Review Templates...' from the list and then the 'Settings' tab.
'Anonymous reviews' allows you to make all reviews anonymous. Unticking the option will make all reviews un-anonymous again. Not that any reviews written while this box is ticked will be locked to anonymous.
'Allow only star ratings' allows you to lock all resources to only be a star rating, and not include a text input review. These reviews will also be automatically approved as there is no content to be moderated.
The final setting allows you to define the time period (number of days) taken into account by the 'Latest Reviews' homepage widget.