First thing...rep points are just for fun. They're usually given in rep begging parties, help is given, or something you agree with/ridiculously funny is said. We've had about 832.4 threads about it recently, I started one myself when I first came, so I'm not pickin on you.

Vibrato....Uhhhh, I just wiggle the string back and forth quickly. Theres other styles and ways to do it, such as circular vibrato like Steve Vai. All I do is wiggle the string with my fretting hand while hold the note(s) down. It becomes second nature after a while.