you must choose freeze and firen.Make sure u control one of them.If u choose freeze, you must search for firen and run towards him until there is an explosion.Another way is when u start the game, there are some words which says,"NOW LOADING PLEASE WAIT" and when u see that words, quickly type in www.lf2.net before the VS MODE and those kind of thing appeard.WALA now u can use JULIAN and FIRZEN.

Enter the data folder in the game directory. Move the "template.dat" file into a new folder for safekeeping. Go back to the "data" folder and find the "firzen.dat" and rename it to "template.dat". Begin the game and select your Firzen at the selection menu.