Naturally, Jim Holians post #20 mentions the turn signal bulb and they can be more trouble and that fact and the cure is buried in the info on TS bulbs.
The resistor has a wire at each end, and each wire is attached to the wires coming from the bulb. It is wired in parallel with the LED bulb. The resistor is actually like another filament for the bulb and supplies the resistance that is missing from the LED bulb. Instead of supplying light the energy is given off as heat, so be careful what it touches. These could be soldered in, crimped in or you could use two of those crimp on connectors used to add a new power line from a nearby power line.
Somewhere in this forum the Ohm requirement for these resistors is given,