The safety button is just held in place with a screw.
You can see it from the top.
However, the actual safety is inside the receiver.
So, the trigger guard and assembly must be removed.
Just two pins hold it all in place.
Then you can see and replace the safety.
There's plenty of youtube videos on how to do it.
http://www.youtube.com/results?searc...sassembly&sm=1