I'm very new to all this and am sru...

I'm very new to all this and am sruggling to install my wireless adapter. I've installed the router onto the main socket and then the adapter which has its light glowing as if it's connected but I think I missed putting in an eight number password so its not picking up signal from router. If that makes sence.
I have wires all over the place and am not at all sure what Im doing.

Regards Jacqueline

Sorry I couldn't even find the product category, which proves I'm out of my depth