Help with my first scarf!

I need help with my first scarf. I’m supposed to be knitting one row, then on the second, knitting 2 stitches and then purling the rest. For some reason, when I’m going from knitting to purling, I’m adding on a stitch. Any clues what I’m doing wrong? I’m going crazy here. x

Any help is greatly appreciated.

Are you bringing the thread to the front to make the purl?

I’m new too, so I’m just trying to imagine what could it be…

I think that’s exactly it. When you switch from knit to purl, you have to bring your yarn to the front between your needles or you get a ‘yarn over’ stitch, which is an increase. When you go back to knit, you need to bring the yarn from the front to the back.