Hi my name is ***** ***** to Just Answer. I am reviewing your question and will reply ASAP.
I presume you mean Mac OS X 10.8.5 not 8.5
There are many ways to delete a file. You can select it and press Command-Backspace which moves it to the Trash. You can select a range of files and do this, then right click the Trash icon and click Empty Trash.
You can also right-click a single file , click move to Trash. Then right click Trash and click Empty Trash.
Let me know if I have the right meaning of your question, and if you have any further questions I would be glad to answer.
Have you been able to delete?