To install Love Factory go to "Extensions/Extension Manager" in the upper menu of the Joomla backend.
Then, in the "Upload Package File" area click on the "Browse…" button and choose the ZIP file from your computer. After doing so, click on the "Upload & Install" button.
When the installation is finished the following message should appear.
In case you wish to uninstall, simply go to "Manage", check the Love Factory components and click on "Uninstall".