This path is a relatively new feature and was introduced in Magento CE 1.9.2.2 (or as SUPEE-6788 patch for older versions). So unless you install the patch, those instruction do not apply to you.
I suggest you describe what exactly you did to add your blocks because right now we don't have much to work on. Maybe your scope is wrong? Perhaps there's syntax problem? Block is not active? Maybe you pasted you block markup to the WYSIWYG editor? I don't know.
PS. You should also post you messages to correct topic. This topic is for introducing yourself to the community.
Tanel Raja