I need to know how to use it.
I understand manuals are hard to come by. This link Sears Craftsman Router Template Set Letters Numbers 9-2573 Woodworking has pictures of the box which give help in figuring it out. It has one single template holder and uses 5/8 and 7/16 guide bushings. My guess is go down your board with template holder and mark lines on the sides, move it to the right lining the left side to the marked line and then add a new on the right. Do that all the way down the boards and decide where you want to put your words and spaces. You'll need some sign making router bits and time to play around with it. Look at the Milescraft Sign kit it may give you some direction.I need to know how to use it.