Curl up one of the ends of the copper trap tag using long-nosed pliers, like this:
Hook the curled end of the tag around a link of chain, like this:
Using your fingers, roll up the tag around the chain link:
Finally, once you've rolled it up as far as you can with your fingers, use your pliers to crimp down the end of the tag so it is rolled up tightly:
Then just boil your traps with the tags attached like this. They will turn dark and blend in with the chain.