Installing Extrainc is easy, just upload it to your /wp-content/plugins directory.  The extrainc.php file should go in that directory,
then also upload the extrainc folder to that same directory. (being /wp-content/plugins/extrainc/)  You will probaly have to CHMOD the
/extrainc/extrainc_include_list.txt file to 666 so that the include list may be updated!  Otherwise, errors may occur.

To activate after uploading, go into WordPress administration, then plugins, and click activate Extrainc.  If you have any more questions,
feel free to E-mail me at mck9235 <at> gmail <dot> com.

The Extrainc menu is found under Options -> Extrainc

The Extrainc information + download page can be found here: http://www.somecoders.com/extrainc