Right this is how to work Ladder Stitch.
First mark 2 parallel lines on the fabric with a fabric pen. Using a blunt needle work from top to bottom. First bring your needle up at 1 and down at 2, up at 3 above the stitch and down at 4 and up at 5. Now without piercing the fabric pass your needle under the stitch above from 6 to 7. Then working on the opposite side pass the needle upwards under the crossed ends from 8 to 9. (Picture 4) Insert the needle at 10 and up at 11. (Picture 5) Pass the needle from right to left under the crossed ends of the stitch above. (Picture 6) Then on the opposite side pass the needle upwards under the crossed ends of the stitch above. Repeat the above steps shown in pictures 4, 5,6.
Continue working down your parallel lines as shown in the photographs below. You can work a straight line as I have done or a curved line. The ladder could also have a metallic thread running through it or back stitch down the centre. It's a little tricky to get started at first but works up quite quickly!