How to empty the Trash? Delete or Secure Delete? What if “you don’t have permission”? How to delete “locked” files? Frustration?
Take a deep breath and read this https://support.apple.com/en-us/HT201583 then happily fix that problem. The report was last modified 2-12-15.
Apps: Adobe and Alternatives
"Sometime in the past you installed software from Adobe. When you did this, it scattered a bazillion files all over the place on your Mac. Now you want to delete the Adobe software. Good luck finding all the cruft!" exclaims Past Prez Art Gorski.
He goes on, "Utility programs that claim to be able to uninstall software for you fail miserably when faced with the Adobe challenge. Here’s a good on-line discussion of the involved procedure needed to absolutely clean this stuff off your computer:" http://www.macintouch.com/readerreports/applications/topic3000-026.html#d12aug2014
How to Forward Delete
"If doing a forward delete on a Mac is a bit cumbersome for you, he's a tip that might help," says Jim Hamm. Take a look at Using the Delete Key on a Mac & Adding a Forward Delete Button http://osxdaily.com/2013/04/26/delete-key-mac-forward-del/