Welcome to Android Central! Go to Settings>Language & Input, and make sure Google Voice Typing is checked on.
Also, look closely at your keyboard--sometimes the mic symbols is in the corner of one of the keys, and you have to access it by long-pressing that key. Or look for a key that has "..." in the corner, which means there are multiple other options for that key (long press to see them).
I have checked + rechecked all the settings recommended w NO LUCK...what could it be..??....maybe this phone doesn't have that capability ??.....I'm STUMPED...it's there ANYWAY to get that feature put on my phone??....HELP PLEASE !!