You will find the Swisscom router WPS button or connection button on top of the router at the front, in front of the WLAN button. See the PDF instructions(opens in new tab) for more help.
If your home is connected to the fibre-optic network, you will usually have a fibre optic socket. You will find it in your living room or hallway. The fibre-optic socket will show the OTO number or OTO ID – a sequence of numbers and letters for identification.