ok you didn't see which template or cms you were using so i guessed (wrong). Assuming you have downloaded the rocketlauncher for wordpress with a template. The same thing applies - check out the instructions. You basically will have one zip file that you upload on to your server and then unzip there (so you will have several directories and lots of files). The rocketlauncher contains wordpress and the template. So, first you must install wordpress (that you have unzipped from the rocketlauncher) and as part of that installation you install sample data and the template. Please follow the instructions (this is the one for radiance).
http://demo.rockettheme.com/wordpress/wp_radiance/tutorials/rocketlauncher/
Regards, Mark.