First of all do you know your IP Address
Then you need to put in the address bar in the Internet, like this:xxx.xxx.xxx.xxx
Then it will ask for the account on your computer and your password-put them in
Then it should take you to a page that says: Setup, Wireless, Security, Access Restrictions, ect.- click on Wireless- then there should be some options under wireless in a blue bar. Click on Wireless Security( not to be confused w/ Security) Click on the bar that says Security mode next to it. Change security mode to WEP, Then click on the thing where it says WEP encryption. Pick 64 bits, 10 hex digits
then click Generate button, 10 Number/letters should come up
then where it says Key 1: write down the ten digits in the box. Then pick save settings. Done. Then configure your Wi-Fi settings on your DS
@Code Try saving the image as a PNG