Hello sir, if you mean (https://www.pcbway.com/project/shareproject/400_Watts_Stereo_Audio_Amplifier_Board_DIY_2SC5200_2SA1943.html) this board, you can directly order in that place.
generally pcbway is pcb manufacturer not the pcb designer or seller. you can use their design service to get the pcb designed easily and professsionally.