If binding, buy a soul gem from the grocer and use a luminous bottle. There is a binding device in it. Put the device in the middle and put a soul gem. Just click on it. After the device is bound, you can add a signature. Find the "equipment forger" in the city and click the third one to add a signature. Every signature of an equipment needs a second-class material. Helmets, clothes, shoes, wristbands and belts should be signed with hard covers, and weapons, necklaces, rings, Yu Pei and deputies should be signed with silver. Go and have a try.