Congratulations on stringing your racquet. Easy isn't it!?
As mentioned, the instruction manual for this machine advises to use a one-piece job and use a starting clamp to clamp one end of the string. The starting clamp is used on the outside of the frame.
Then you string an entire half of your racquet, using only the single fixed clamp. Please note! This is not advisable on a modern racquet as the stresses involved may crack the frame. When you've finished and tied off the completed half, you start the second half, thereby only using a single fixed clamp for the entire frame.