Can you see clearly where the petals are? It might pay to ink up and stamp off and clean it. Usually causes minor staining of the stamp. Then it would be more obvious where to place it inside the outline.
I looked at it bc sometimes their things are not meant to be exactly aligned but this is...what I saw and think is a good idea is to find a couple of "landmarks" the stamps have in common. Like the outline and the solid color in (#2) stamps along the perimeter. Maybe make a mark with a sharpie pen on the back of the stamp but I would start with a pencil to be sure it works.
For the next two, find new ones in the inside of the bloom.
Another choice might be to use the pen to go around more of the perimeter of the color in stamp (#2) on the back if more guidance is desired.
It is a pretty stamp. I hope you get it worked out!