make sure you remove the super large electrolytic cap. And replace it with a 1nf cap. Otherwise bust out a multimeter and learn the circuit. There is a button spot on the bottom of the circuit board that needs to be bridged (shorted) for it to turn on. And most of the time they have a + and - Labeled somewhere on the board for supply voltage
Your photo flash is more or less the same circuit. just a different layout. The really big electrolytic cap needs to be removed or you could seriously hurt someone. And then place the 1nf cap in its place. The circuit should have a + and - labeled hole for supplying the 1 AA or 2 AA batteries. Otherwise youll need to grab a multimeter and test what you think is ground etc.
How to Make a Solder Buddy (from sheet plastic)