How do you move a file to the trash with ONE keystroke (Can't believe I'm wasting time on this!)

Everytime I want to send a file to the trash, I have to either perform some kind of key combination/shortcut or use the trackpad/mouse, right click and select "move to trash", or drag the file(s) to the trash! This is absolutely ridiculous. Why can't I just press the delete button??? I cannot take it anymore! It's such a waste of time.

After some research, I finally found a post with the answer I was looking for from user par larsson

"You can also go into System Preferences and make a new keyboard shortcut. I turned one of the function keys into a "Move To Trash" key.

1. No need to use the mouse for something that should be simple and quick.

2. Single button press just like in Windows."

Seriously!

Now the problem is how do you do this?

1. I went to the system prefs > Keyboard > Keyboard and checked "use F1, F2, etc... as standard function keys.."

2. Under keyboard shortcuts, I selected "Application Shortcuts" and clicked on the "+" sign

3. I selected the finder application, entered "Move To Trash" in the action box, and F12 as the key (because it's next to "delete")

That did not work. It just opened the dashboard instead.

4. I went back to "keyboard shortcuts" and found F12 was already assigned to open the dashboard. So I unchecked it and tried again.

That still didn't work. I would select the file to be moved to trash, press F12, and after an error "beep" sound, the last file in the folder was highlighted.