First create Info files from the Texinfo files with the `makeinfo' program. makeinfo is available as part of the latest Texinfo package:
For information about the Texinfo format, read the Texinfo manual which comes with Emacs. This manual also comes installed in Info format, so you can read it online.
Neither texinfo-format-buffer nor the makeinfo program install the resulting Info files in Emacs's Info tree. To install Info files:
* Topic: (relative-pathname). Short description of topic.
If you want to install Info files and you don't have the necessary privileges, you have several options:
C-h i g (~/XXX) RET