noob question but what is the gnome environment and how do i install my dependencies through the gnome environment? sorry and thanks!

EDIT: ah now i just found the gnome terminal but how do u install dependencies through it? i followed the tutorial and double clicked the rpm files to install them. i have no idea how to do this through gnome. any hints?

EDIT 2: i double clicked on the rpm files again to make sure and it says that the package is already installed if that helps. so it must be somewhere, its just that vlc is not seeing it i guess. hope that helps