Intarsia project - how to i work in the dangly yarn

Hello all

I am knitting a cardy for my niece with flowers over it. This is my first attempt at intarsia (and I am not that experienced a knitter anyway). There are lots of dangly yarn and some bits look a bit loose where the yarn ends. I am told to work it in - but I don’t know what that means! it seems to be so basic no one has bothered explaining it to me. Can anyone help?


acutally i have just seen the video explaining this, so ignore me…