embroidering side of cap.

Can someone please explain to me how to hoop a hat to embroider on the left side. I am trying to use my flat hoop on my brother pr-620. I'm having a hard time getting it straight. Please, help!!

Location: 
United States

It is impossible. I use very small hoop (6x4cm, the smallest hoops) to make embroidery on difficult of access places.