Knitting abbreviation

i have a pattern that says “ym” or “yrn”. can you tell me how to do either stitch?

YRN is the same as a YO…or Yarn Over. At the top of the page there is a glossary for knitting terms. See if that helps you out.

I"m not sure about the other one. Usually the patterns gives this kind of information, too so check that out.

ym usually refers to yarn marker

thank you.