If you are able to connect your Wii console online, then you do not need to adjust any of these settings. However, sometimes you may need to manually enter information. Do this when:
To Complete the "Change Settings" information:

Your SSID or Service Set Identifier is the name assigned to the access point of your wireless network. Enter the name exactly as it appears in your settings on your router. For more information on locating the SSID for your router, check our router lookup tables here and select your router manufacturer and model number.
WEP and WPA/WPA2 are security settings for your router.
If you know you do not have a security setting on your router, you may leave this field blank.
If you do have WEP or WPA/WPA2 security, you will need to enter a key through your Wii console to use the access point. The WEP or WPA/WPA2 key is usually found in the "security" tab of your wireless router settings. For more information on WEP and WPA/WPA 2, click here. For information on locating your router's WEP or WPA/WPA2 key, click here and select the manufacturer and model number of your router (if available). Once you know the WEP or WPA/WPA2 key, you will need to enter it when prompted.
Please note, in most cases, this will be all the manual information required. Select "Save" and then Tap Test Connection. If you are able to make a connection you can skip the remaining settings.
Auto-Obtain IP Address, IP Address, Subnet Mask, Gateway, Auto-Obtain
DNS, Primary DNS, Secondary DNS:
Locate the TCP/IP properties on your personal computer. Accessing the properties
of the TCP/IP properties screen may vary from one operating system to another.
In Windows©, Access Control Panel ,
select Network
and Dial Up Connections, select Properties for your Local
Area Connections.
Select Internet Protocol (TCP/IP) on the list of components. and click on the
Properties button. You should see a dialog box such as this:
If Obtain an IP address automatically and Obtain DNS server address automatically are both selected, then select Auto-Obtain IP Address and Auto-Obtain DNS on the manual select dialog box.
Now "Save" and test your connection. If this is successful, then you are finished.
If Use the following IP address is selected, then do the following:
If Use the following DNS server addresses is selected, then do the following:
Enter the information for Preferred DNS server into the Nintendo DS exactly as it appears on the Internet Protocol (TCP/IP) dialog box. Enter the information for Alternate DNS server into the Nintendo DS exactly as it appears on the Internet Protocol (TCP/IP) dialog box.
After entering this information, test your connection.