You simply go up to the bomb, make sure the screen says something like " Press and hold X or Square(depending what console you have)" and follow its directions.
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You have to press save and quit.
Same as MW2 Press L3 then move to a direction the press X
Mw2 doesn't have kill confirmed.
You can Prestige in MW2 precisely 10 times.
Reach Prestige 1 and Level 69.