Rightnow is right!
If it looks like birdseed then you need to grind it.

But if it is described as being 'milled' I assume it will have been ground already.

I havent been able to find a ready-ground supply cheaper than the seeds, so still grind my own as I go.

Apparently if you do buy the ready ground stuff it will need keeping in the fridge or freezer as it goes rancid quickly.