I covered this in the EZ MOD Install video for the Fighting Edge, but even the seasoned modder misses things. If your PS/SHARE/L3/R3 buttons dont work after installing the EZ MOD, flip the TOURNAMENT MODE switch to ON, enabling the side buttons. It may seem backwards from how it works stock, but, if you think of it like Turning the buttons ON and OFF it may help.
Here’s the full EZ MOD install video: