Originally Posted by Strubie
^ Can you give me a description of how to do that please?
sorry if I'm asking too much.
It depends on your router. But if you're asking this chances are you never went into the router settings in the first place, unless you had someone else set it up for you. If you did in fact have a third party handle the router setup I'd suggest you ask them to help you out.
If your router is running in its default "out of the box" configuration then there won't be any access restriction for MAC addresses, it's something that has to be turned on and manually configured.
I assume if there is a password for the network that you are entering it correctly (watch the upper/lower case, check the selection that shows the characters as you type so you can be sure they're right).