In the Extended tool select "Delete contents of Units", you cannot delete the unit from the GUI. Also keep in mind that it will restart the system and the data will be deleted for good.
Yes I already discovered that, My issue is that in the extended tools delete contents of units I cannot seem to select the unit. I can only select between OK or Cancel.
You should be able to move the courser keys to the unit then use the space bar to select the unit to delete, unless you are using the putty session and the VT100+ is not enabled or you directly at the server w/ keyboard.