So, after a long time trying to make optifine work with forge, I made a fatal error. I decided just to cut my losses and reinstall minecraft but now there's no bin folder. There's not one in the versions folder as I heard there was and no solution seems to work. Thanks !!
Hasn't been a bin folder being used in minecraft for over a year.
You are in the wrong forum in any case, but perhaps you should read: http://minecraft.gamepedia.com/Mods/Installing_mods
Go to the section for the new launcher.