Do you have a Stout or Slim? My newer "stout" has a bobbin case with a latch and works like most machines with bobbin cases.
However the Slim is quite different, and takes some dexterity to work the release lever and pull out the bobbin case at the same time. I have to use both hands to get the job done, but it's not hard. I pull up the lever with my index finger of my right hand and with my left, get my thumb and index fingernails wrapped around the center part of the bobbin case and pull. I'm not sure I could do this without fingernails though.