The English sentence in the underwear design and technical specification is "Nail the pad by hand at the fan-shaped edge of lace".
Hand nails are fixed by hand. Book more laps (the exact number depends on the instructions in the guest manual. If not specified, you can also ask the guest's requirements. Usually do it, you can refer to it). In fact, it is similar to the function of punching the date, in order to prevent it from falling apart or fixing the line.