Can't connect to internet  (help!!!!)

I really don't know much about computers, but I have a mac and there is no mac dealer in town, so I can't ask them to help me. I am trying to connect wirelessly. There is another computer in the house, which uses ethernet and is equipped with a wireless router. The router is a D-link (DI-524 AirPlus G) which is supposedly compatible with macs. Airport is on, and working and sometimes 'connected to default', but I can't actually connect to the internet. I have tried many different ways to set up but often am at a loss for information, which apparantly tha administrator knows, but I am the administrator and I don't know. I don't know my password either. So yes, I need all the help I can get. (please..)

I'll give you some general advice, which applies to all manufacturer's wireless routers. If you attempt to get your Mac to connect to its wireless network (by clicking on the wireless name as it appears after you click on your Mac's Airport menu) and you are prompted for a password, what you need to enter is the WEP or WPA password that was previously configured on your router. If you cannot remember what that password is, you will need to access the router's configuration (you can do that from the other computer you have which is able to connect) and find out the password. At the same time, make a note to yourself as to what type of security the router was configured to use (either 40- or 128-bit WEP, or WPA).

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