Not letting me add files to me external hard drive

I literally just got home from the apple store because my mac was not recognizing the new maverick update, so they fixed that but now I cant add file to my external hard drive! why is that?  there is a whole bunch of room on it still...... please help

Linc,
I was sitting here reading some of the other posts and figured this out. I have a Logitech Keyboard for Mac. I highlighted the G Drive Slim Icon on the desktop. Then I held down the Command Key and touched the letter "I" key. This opened a window that says "G Drive Slim \ info". This is where you enable or disable the Read or Write Permissions.
Thanks for your help,
BigTex415

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