'Stitches should only be counted after fourth row'...Huh?

I don’t really understand what this means. I’m trying to learn different stitch types and some I’ve seen make this instruction. I don’t know what this means. Could someone please enlighten me?

Thanks in advance!

Sometimes the number of stitches in a stitch pattern will change depending on the row. Stitches will be added on one row and on another row will decrease, returning to the original stitch count. Could this be the case here?

What is the name of the pattern you are working on? Do you have a link?

It’s called the ‘Puffed Rib Stitch’ found here: http://newstitchaday.com/how-to-knit-the-puffed-rib-stitch/

The stitch pattern is a repeat of 3 stitches plus 2. In row 1, you will be adding 2 stitches to each pattern repeat; if you were to do a stitch count after rows 1, 2 and 3, you would have a repeat of 5 stitches plus 2. In row 4, the k3tog in each pattern repeat will decrease the stitch count to bring it back to the original stitch count of 3 stitches plus 2.

And those increases are made by the yon and the yofn?

Yes. If you are feeling uncertain about if you have done the increases correctly, you can do a stitch count after knitting row one. You should end up with a multiple of 5 stitches plus 2. How many stitch pattern repeats will you be doing? What are you knitting?

I have not encountered the terms ‘yon’ and ‘yofn’ frequently. For me, I would simply translate both of them into yo’s (yarnovers), due to the familiarity of the term.

I have not encountered the terms ‘yon’ and ‘yofn’ frequently. For me, I would simply translate both of them into yo’s (yarnovers). In reviewing the video for this stitch pattern, they are yo’s.

Ah okay. I’m knitting an afghan; making various squares of roughly 12"x12" with different colours in different stitches then I will be seaming them all together.

Yes, both yon and yfrn (yarn forward round needle) are yarn overs. Yfrn is just trying to be a little more explicit because the yo occurs between a knit stitch and a purl stitch.
The video should help make the stitch pattern and the yarn overs clear.