The Absus2 is both a barre chord and a pinky stretcher, it will take some practice to master! Start by placing the index finger across the first fret leaving the top hanging over a little. Make sure your finger flesh contacts all the strings when you press down, pluck them individually to make sure none are muted. After that take your ring finger and put it on the third fret of the C string and the pinky will go on the fourth fret of the E string. Keep those fingers straight up so they don’t interfere with other strings. The stretch and hand position will be a little uncomfortable when you first play it.