If the powerline lights are on its just like using a wire between you and the router. Get in working first with a wire first if in doubt, Your laptop must be set to DHCP, or if static set to the same...

Unless you have gigabit devices, e.g, PC with gigabit card and NAS other end with gigabit card your devices are probably 100Mbps so won't use the extra speed. If youre just piping your internet...