If your flat is already connected, you will normally have a fibre Internet box in your home, which connects your home Ethernet network to the network. This box is usually located near the entrance, or next to the electrical panel of your flat (but this is not always the case). If you do not have such a box at home, it is probably because your flat is not connected. You will have to ask for an installation. Be careful to allow for any complex wiring costs if you live in a building that is not connected, or in a house, for example.