Hi @amyanne67 , welcome to the community!
Sorry for the trouble. I checked your account and it seems like not so long ago you upgraded from Plus to Premium. Since Premium offers a bit more options for you to listen, first you need to go to My collection, then sort your content by stations, and after that you will see the option to shuffle your music:
1. My collection:
2. Sort by Stations:
3. Shuffle:
Hope this helps!