Repeat the tinning and soldering process for whichever pads you need access to on the Flora for your project.

If your circuit design only uses pads on one edge of the board, solder studs to one or more pads directly across the circular board to serve as anchors (these will act as mechanical connectors only). Three areas of contact around the circle is even better. Or just solder a stud to every pad for maximum future-compatibility!

Try to space the studs evenly while leaving as much clearance between snaps as possible.