Can't access the Internet part of games

Hey allI'm a noob at all this so I'm probably just asking the same old question. So I apologise.I have an r4 card and a 2GB SD micro. I have downloaded the .nds file and copied it on to
the SD micro card. Game works.
However when I try and access the on line part of the game the screen becomes blank and nothing happens.Am I missing something?
Have I not installed a piece of software that I need.Please help a struggling nooncheersSuds

It depends what ROM you are using, the R4 doesn't support all games to go WiFi/Online.
Games like Mario Kart DS, Tetris DS and more of the old ones work for me to go WiFi/Online though.
There is currently no software to support the R4 for going WiFi/online for some games.I hope I helped you out :)