At the very bottom of the main menu screen (literally at the edge of the screen), click on the word ‘credits’ in tiny white text. Also, since you didn’t know about ECM weapons I’m guessing you’re new to these games so just in case you aren’t already aware, GSB2 is basically dead. It’s unfinished and will never BE finished. It works, for me at least (though not for some users), but any bugs or imbalances will NEVER be fixed and there will NEVER be any new content for it other than user-made ships and challenges. With that said, if you can deal with these issues it’s still good fun, though I personally find it gets boring much faster than GSB1.
EDIT: Oh yeah, and it crashes a lot. Really, A LOT.