Previously, I had setup of internet router with multiple devices hard wired including a main deco M5 and two wireless M5 extensions.

I finally can afford an internet speed increase,  so I called them and they sent me a new router.  Also had it set up in different room while they were at it. 

Now the setup is a little different. 

Router > wired main deco > two wireless decos.

I was able to connect everything I had previously wired via wireless connections except for the printer which doesn't have wireless capabilities.  

I saw there's an option to connect wired into one of the extensions M5 deck using LAN connection? But I can't find the printer now,  and i have no clue how to fix this as I'm obviously technically challenged.  

Please help.