What kind of stitch holder? It helps if you give us all the info in the first post.
To put the stitches on a needle you just stick your needle through the stitches. If it's on waste yarn cut the yarn and take it out after the needle is in. If it's a needle holder you can can pull it out stitch by stitch and put the needle in.
If you're using straight needles make sure you're needles tips are facing the right way to knit whatever you need to next.