Using or terry towel cloth or an abrasive pad, red fine scotch pad, fold in half and place within the pad a section of toweling then soak the toweling in leather prep just so it starts to run out on its own.
Preparation of the leathers surface is the key point in leather color repairs / leather restorations do not skip these steps it will not work and rectifying it will take time!
Gently rub the red pad over the surface of the leather to begin to remove some of the old colored coating, you don't have to remove all of the leather paint on the surface just enough to give the surface a key to bond the new leather repair paint to it.
As you move the red scotch pad over the surface use a terry towel rag to wipe away the paint that's being removed as you go.
You don't want to remove all the surface paint, just enough so it starts to show the natural leather color through it, this is enough of a key to apply the new colour, once completed wipe over with alcohol cleaner.
You are now ready to carry out any repairs to scuff, tears or holes, you cant repair these until you have carried out the prep stages, once they are done your ready to apply leather repair paint.