Can't delete/destroy Dataset

[Nightowl805]

I had successfully connected to Mackbook and made a time machine and and Macbook share. Time machine started but got an error.....I had made amount available to small. Tried multiple time to edit timeshare in freenas by increasing that limit but it wouldn't take. Now trying to destroy dataset but says it can't unmount, system is busy??? I think I unmounted and deleted everything on the MAC side

 

[Bidule0hm]

Try to delete the share before (in FreeNAS).

 

[DrKK]

As bidule0hm says, you must go to the SHARING screen, and delete any shares for this dataset, first.