Problem with adjustment

[Nightrider]

Hello, I am trying to get some help. My chain is rattling like it was trying to move from the 5th gear to the 4th. I was able to eliminate most of the rattling by adjusting the cable adjuster. At this point there is still a little bit of noise. It appears to only be doing this when position 5 at this point. The cable adjuster is turned clockwise as far as it will go. Is there anything else I can do.
Nothing appears to be bent. At least that I can tell. Keep in mind I am kind of new at this.

[GeorgeET]

Suggest looking at these videos.Once all is set up right and re tuned. Problem could be in the shifter itself, clean that too.Let us know how all that worked.

http://bikeride.com/adjust-front-derailer/

http://bikeride.com/adjust-rear-derailleur/

http://bikeride.com/rapid-fire-shifters/