To put your Scheme into Development Mode you go to
Admin -> Schemes -> Advanced
Then tick the check-box 'Show developer features for this scheme'
If you enable development mode for your scheme, Administrators will have access to additional tools and logging which will help you to build your rating and rules, e.g. the Rating Log on the View Case > Activity page. You will also be able to rename SystemIDs in Admin > Questions. You will notice there is a small edit button to the right of your question system id's.
Note that changing SystemIDs is not recommended once they are in use as it may break your documents or reports.