Drush and Drush Make are not regular Drupal modules. They are php applications that run directly on the server in terminal as commands.
If you do not have access to install apps on the server or are unfamiliar with the Linux OS distribution that your site runs on, you will want to consult your system administrator first before attempting the install.
For those running Ubuntu 10.04+, you can easily install drush by using Aptitude and this command:
user@server ~$ sudo apt-get install drush
Beware that your user account will need super user permissions to run the command.
Drush (DRUpal SHell) for Drupal is a command line tool that allows users to perform most of their administrative actions from the terminal as opposed to going through the Drupal administrative pages.
