First off, please bear with me if the answer to this seems obvious since this is my first time using linux. I've been trying to mount and run several iso files on my computer (games and movies) the following way:

I open the Terminal program and type the following:

mount -o loop -t iso9660 file_name.iso /media

where file_name is the name of the particular iso im trying to mount at the time, I get this as a reply:

mount: only root can do that

so my question is this, how do I get root privileges in the terminal program so that I can mount the .iso files?