Order this option if the configure files of your shop need to be set up or changed. This may be necessary if a shop was moved or an ssl certificate needs to be enabled. Another reason to consider this change is hackers. The reason for this is because all hackers that are even slightly familiar with oscommerce know that admin is the name of the admin and that is where they begin looking to get information about your shop. If it is renamed, there is no way for them to know the name so it is good change in the fight against them.