How to get my Nook Color and Blu-Ray player and my 3DS to connect to the internet?

I live in an RV park, and I have a Nook and a Blu-ray player and a 3DS that can connect to the internet, but the internet is a strange "open/secured" network. So none of the items can connect. I have to connect and then it prompts me to put in a username and password. I'm not sure if I can even connect with any of these items because it doesn't give a prompt for the username/password like my Nook does. But my Nook has a problem with a MAC address. Sometimes it'll connect, but then it'll go out and most of the time it'll say MAC address issue again.

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