@Confuse.1_all- 

Start with the main powerline adapter or the one wired to your router. Test the Ethernet cable that goes to that adapter to make sure there is an internet connection coming through. If not, swap the cable or change the port on the router.

Look at all the powerline adapters and look at the powerline light to see if it is on (house icon). If it is not lit, pair up the adapters again so it lights up. If there still is no LED, move the adapters do another outlet or to the same room and pair them up again. If they pair up in the same room, but not where you want them, then you need to use a different outlet.