When you already had the theme package, then put the all folders 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.

You can Download or Delete themes at Themes Manager, now take a look at Actions Column:

#Theme Manager & Actions Column.

You can delete theme, just simply clicking on Trash Bin button:

#Click on Trash Bin button to delete a theme.

You can download a theme as a package by clicking on Download button:

#Click on download button.

Then download the package as a zip file:

#Package downloaded.