This is a step-by-step picture tutorial on how to Slip-slip-knit (ssk).
The first step is to slip (knit-wise) the next stitch on the LHN onto the RHN.
This is how the stitches should look after the first step. Again, pay no attention to the tail, it would normally be in back, but for this particular pattern the ssk follows a yarn over.
The second step is to slip the next stitch on the LHN onto the RHN. At this point there should be two unworked stitches on the RHN.
The third step is to insert the LHN into the front of the two unworked stitches.
Then, you will wrap the yarn around. This is the same look as a knit through the back loop (ktbl), people generally use a regular knit stitch, but I find this to be easier for me and it doesn’t make an obvious difference in the finished pattern regardless of how you knit these stitches.
Finally, you release the stitch as normal, and this should be how it looks. In this picture you can see the yarn over that caused the tail to be in front earlier.
I hope you find this useful. Happy Knitting!