Hello everyone. I think this forum is wonderful and this is the first time that I participate.
I start knitting a few months ago, when I found out that I was pregnant. I a trying to knit a sweater for my baby with a pattern that I found in this website, but I do not understand one part of the pattern. I will appreciate if someone could help me, because it means a lot to me to be able to do this project 
The pattern says "work even in garter st [I][U]until 2 purl ridges on right side[/U][/I]. (RS) Button hole-K2, yo, k2tog, k across"
The part that is underline is the one that I do not understand. what means: until 2 purl ridges on right side? how many rows am I suposse to knit?
Thank you very much for your help