Kulgia

How do you add in new characters in 7.0?The part where I have to edit data/select.def.I don't quite get it.

Hey there I'm new to MUGEN,just played this game and the first character I used was Yuuka.I love it but...what is the A(X),S(Y),D(Z) buttons for? And also... YUUKA NEEDS SPELLCARDS No offence though Thanks.