This is probably your metal code
Ok and this is your glowing code, correct?
Now if you want to put a glowing marking ONTO the metal, your base texture would derive the metal code, like so:
But in this case, your whole body would be metallic.
Now as for a "leg only" metal code WITH glowing markings, it would be:
At least I THINK it's supposed to be like this. I remember on my old account, one of my presets had a metallic eye that glowed in the center, so I may not remember the EXACT coding CORRECTLY.
EDIT: I think I may have found a guide that may help you:
Metallic Markings Glow MarkingsEDIT2: Tested, it works, just remember, your base body texture has to be a png and have transparent areas where the metal texture shows up underneath.