So I am trying to change my feral form in the druid class hall. If I remember correctly you click on the little plant in the hall and it opens up the artifact appearances (I did this a week or so ago no issues). When I go to change select a new appearance I unlocked I can no longer click on the plant. What am I doing wrong?
The order hall only works to change the appearance if you have the actual artifact equipped. (And you can only interact with the seed if you have an artifact equipped.)
The more general way to change you druid appearances is using the barber shop. (Your options will include any unlocked artifact appearances.) Ask a guard in Dalaran to direct you to the barber shop.