Step 1: You'll notice some stitches along the edge look like the one below in the photo - a clearly defined crochet stitch. You should slip stitch through the back loop, which really means insert the hook in between the front and back loops to complete the slip stitch.
Step 2: The next stitch will look like a tighter, smaller space, and it won't look like a regular crochet stitch with front and back loops. Just slip stitch in this space.
Step 3: The next stitch will again look like the usual crochet stitch with front and back loops. Again, slip stitch through the back loop. Continue in this manner, which will alternate between slip stitching through a back loop, then slip stitching through the next space. Slip stitching through the back loops makes the edge lay more along the side of the cuff, and I think gives the cuff a neater appearance. Slip stitches through both loops makes the slipped edge lay more on the top of the cuff.