...Continued

Fifth,  while still inside the "Render Room",  clear the scene then reload your new scene file.  Sixth,  on your side toolbar,  under options click render options and apply the above settings then close window.  Seventh,  press F9 on your keyboard.  Finally,  sit back and enjoy until the image viewer appears,  then click on the image viewers file button and save out as a RGBA.

Cheers!
patorak