Attached is a circuit for 3 buttons/3 igniters. You can see what I duplicated for each additional button/igniter.
Darth,
The resistor (R2) and LED (D2) limit the current through the igniter so enough current passes to light the LED, indicating a complete circuit, but not flash the igniter. Once the pushbutton is pressed, these are shorted out and full current is supplied to the igniter.
I think the 220 ohm resistor (D2) is probably high enough to provide a safe current, but this is a guess. 1000 ohm resistors for D2 would be even safer, but with some reduction in LED brightness.
Also, from the information so far in this thread, I'm not sure attempting to create control circuits for explosive devices is a good idea with the level of understanding of basic electronics shown. I hope there's someone knowledgeable on-site that can check your work. I've been in hobby/medical/scientific electronics for about 50 years, and I would be very reluctant to want stake other's safety on what's been shown. I've built enough circuits over this period to know errors can be made even in the simplest of circuit assemblies...especially if one doesn't know why a circuit is designed the way it is.
Just a strong caveat!
Ken