what should I do?
You should seriously consider studying elementary tutorials to save time. At this pace this is going nowhere. You’ll get frustrated sooner rather than later. 
Been there, done that. Too many times.
You asked for advice, I hereby advise - 
- Keep on reading if that’s not what you wanted hear.
If you want to keep going - you should definitely post the script. You only need 1 light, no need to complicate things, no need for flip flops 
- providing the light is off, you can turn it on when the pawn is possessed like so:
- here’s what I mentioned above - see if you can fit this into the existing script:
This would position the light at the location of the selected static mesh component.