I'm working on a pattern in which I have 16 stitches on one needle and I am to K5, [K2tog, yf] 3 times, K5. I wasn't sure how to do a yarn forward, so I looked it up on youtube and found a video showing how to do it, but if I follow those directions, I won't have enough stitches left to knit the final 5. Any ideas on how I'm supposed to do this?
The yf is a YO and the video may have said 'knit the next st to complete it'. You don't knit an extra stitch, you just do the next st in the pattern which is k2tog. So you should have k2tog, yo, k2tog, yo, etc, not k2tog yo, k, k2tog, yo k.
Sue is right. The stitch count comes out correctly when you realize that a yo (yf) comes between stitches and doesn't touch any stitches.