I am using the Terran Tribune template. I want to be sure I take full advantage of the template features. I am a little confused, though. I am not sure how to install Rocket Launcher. I have already installed Joomla and attached to a site. Is it possible to uninstall the already installed Joomla and then re-install using RL?
Yes, you need first to remove your current Joomla install. You can do it with your ftp client.
Then upload the RocketLauncher files, create a new database and start the installation, like you would do for a standard J! package. You will get the full replica of TerranTribune demo site.