Start by reading Installing mu-plugins section in our comprehensive WordPress Multisite Manual if you are new to WordPress Multisite.

To install:

  1. Download the plugin file
  2. Unzip the file into a folder on your hard drive
  3. Upload update-services.php to wp-content/mu-plugins/

 

To use go to:

  1. Site Admin > Options
  2. Scroll down to Update Services
  3. Add each service on a separate line
  4. Click Update Options