You will have to mask the relevant areas, colorize them and overlay them with blending modes like Add. Generally, though, this stuff is done best on set by having a suitable LED or light stick in hand. The color doesn't even matter, since you can change that with relative ease. Otehrwise be prepared that this could be a major pain to do in post with lots of manual roto work...
I understand about the masking but how do i colorize?
I make a new solid,then mask and then?