When you already had the theme package, then put the theme folder into [yourmoofolder/app/]

Example, we added 'test' theme:

#Copy theme folder to [yourmoofolder/app/]

Now go to Admin Dashboard/Site Manager/Theme Manager/Not Installed Theme, and press Install button:

#Press Install button to begin.

After installation, there will be a Message:

#Installation successful.

Now at front-end, users can see new theme has been added:

#New theme has been added.