First you need to add the repo by simply running this command from your server's console:
zppy repo add REPO-URL

 

Next, update your module listings by running:
zppy update

If you have repos sending errors, you can just remove it:
zppy repo remove REPO-URL

And now to install a module run this command from your server's console:
zppy install MODULE-CALL-NAME

Also if you are upgrading to the latest version of a module run this command:
zppy upgrade MODULE-CALL-NAME

And if you want to remove a module you run this command:
zppy remove MODULE-CALL-NAME

Always read the explanation from the post in the forum before installing a new module : some may require many steps.