Hi David,
it is because the tutorial is made in older version.
i could have given some better screens for editing interface in interface determination but i don't have system access now
i am not convinced giving name manually.
http://help.sap.com/saphelp_dimp50/a/En/8e/9a425fa0d0f647af828ebaf923b4c2/content.htm
without completing ID objects testing configuration will not work.
Did you check with basis team about the post installation steps?
i am still wondering why you are not able to get the cache status overview in ESR and ID.
Regards,
Muniyappan.