This chord doesn’t look hard, but don’t let it fool you! Starting out we barre all of the first fret with our index finger. Make sure as you press down that all the strings have clear tones. As soon as the barre is good use your ring finger to play the third fret of the C string. And finally, our pinky plays the third fret on the A string. When you lift your pinky up it causes your index and ring fingers to move so it may take some time and stretching to get the Fm7 sounding good. You may try using the middle and the ring as they might be easier for you.