How to unplug the blue optical fiber socket?

So: 1, now they are all directly connected by optical fibers. The market price of this blue head is about 15-25 yuan, and 5-6 yuan is sold on Taobao. 2. The blue clip can be removed at any time. Be careful not to break the thin thread in front. When threading, be careful not to break the thread, otherwise the optical fiber will break in the thread. 3. The blue clip is called the optical fiber cold connector. Special tools for fusing optical fibers are needed for connection. We can't finish the work alone. We will do this and put the blue connector back as it is. 4. Call the operator to repair it. They can't see what you did.