this is an easy increase (one stitch more is made).
You knit your stitch as usual. But then you DON'T slip the stitch of the left needle. But you knit it once more. This time, though, you knit into the back of that stitch (the part of the loop that is behind your needle). THEN you slip the stitch off the left needle and you have 2 stitches (instead of just one) on your right needle.
in the videos section there is a video for this. it is named "kfb" and you find it in the increases.
Here is the link to the increase videos:
it is about half way down that page and has an English and a Continetal video for it (English: yarn on your right hand / throwing technique // Continental: yarn on left hand / picking technique)