I just recently acquired a used Nishiki Touring bike from the 80s. The bike is in great condition and I've only had to replace the tires and tubes. I am also very new to bicycling and especially repairing my bike. My front brake is super loose (as in I have to squeeze it in all the way before it touches the rim) so I googled how to tighten a brake. It seems simple, all you have to do is loosen some nut then pull the cable tight. I cannot, however, move the cable. It seems stuck. I can't pull it loose or tight. Can anyone explain how to fix this to me? Also what are the barrels that I'm supposed to tighten? I only have one near the brake and not on the handlebars. I tried to take some pictures so y'all can see what I'm talking about. Thanks in advance!