So some people were talking and making nosie while i was recording minecraft and talking how do i remove or mute it????
Unfortunately there is no magic way to remove unwanted background noise in your videos. That's why even Hollywood professionals have to re-record dialog when they've shot a scene around heavy traffic, wind or other background noise.
Welcome to the forum.
I agree with Steve, and especially as you have human voices, that need to be removed, without affecting other sounds in your Video.
This Tips & Tricks article talks about general background noise, and its attenuation, or removal: http://forums.adobe.com/message/2860521#2860521
Unfortunately, your case will be a bit more difficult, as you will need to attenuate, or remove specific Audio, at speific points - much more hand-work, with fewer global adjustments. Still, with work, you might get closer to what you want.
Also, see this Tips & Tricks article, for attenuating Volume (and Gain), in an Audio Clip, even at specific points: http://forums.adobe.com/message/3472343#3472343