Installing the CoSchedule plugin for Multisite is easy!
If you have a Multisite network, you will need to install the plugin at the multisite WordPress admin level.
Go to your WordPress Plugins menu from the Multisite network level, and click Add New.
Search for "CoSchedule", and once it is found click Install Now.
Once the plugin is installed, go to the site level and click Activate Plugin.
Now Sign in with your current CoSchedule credentials, or if you don't have an account yet - sign up here by following the prompts.