First, disconnect lamps and appliances in use when the circuit went out. Also, turn wall switches off. Identify the blown fuse. When a fuse blows, the transparent section becomes cloudy or blackened. Replace the blown fuse with a new one of proper size.
Socket fuses screw in and out just like a light bulb.
Cartridge fuses, which are usually used in pullout section, can be removed by hand pressure. Close the main switch, or replace pullout section, to restore service. Throw away the blown fuse. Never put a penny behind a fuse. If you do, there is extreme danger that your house or building will burn down.