Hardrive Adapter I Have A Lan Adapter For The Wii. Do I Plug It Into The Modem,wall, Or The Big Hardrive Thing? I Dont Know?

I have a lan adapter for the wii. Do I plug it into the modem,wall, or the big hardrive thing? I dont know? - hardrive adapter

The Ethernet cable that I have for the Wii comes with something, I can have an Ethernet cable or what? In addition, I also connect the Ethernet to the modem, the Hardrive or telephone wall jack? Help please!