Acoustic Guitar Pins
I would like to begin by saying whether you have an electric guitar, bass guitar or acoustic guitar use caution when changing out the strings. To make changing the strings easier it is recommended to have an electric guitar tuner and wire cutters. Although it is not necessary but it helps if you have a string-winder also (a string winder is a device that will aid in winding the string at the tuning peg).
The big difference in changing guitar strings on an acoustic guitar rather than a an electric guitar is that the strings are held in place at the saddle by pins. First remove the old string by releasing the tension at the tuning peg, lifting the tuning peg lift the ball end of the string out of the hole.
Replacing the string is done by reversing the steps for removing it. The one thing you must keep in mind is after putting the ball of the new string into the hole you must pull the string tight towards the tuning pegs while you are pushing the pin tight, this keeps the top of the loop against the pin allowing you to correctly tune the string.