Okay, I've found out how to do this. I'm not very competent with unix, but apparently, you can only do the chmod command if you're working from the root user folder or something. So, what you're supposed to do instead of:
chmod 755 (whatever file)
sudo chmod 755 (whatever file)
I don't really know what sudo is, but it seems like a progam that allows users to operate with root-like permissions for 5 minutes at a time, thus you can use sudo followed by any command every five minutes to keep it going. If anyone knows more about why this is necessary and what is really going on, please post. Thanks and good luck.