Onana had been booked going into the shootout and admitted some gamesmanship which saw him booked again during spotkicks.
"Before the penalties I knew that my first yellow card had been cancelled so I was aware of the rules," he grinned.
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"I had to make some provocation to some players and to use my tricks to win the game, so I'm happy for that."
On Coventry pegging United back from 3-0 down to take the semi to penalties, Onana said: "We have a big responsibility.
"Me, I start with myself, like I always say we are here to take all the bullets, you know? When things are not going good I will point fingers to big players, you know? Me, Bruno (Fernandes), Harry (Maguire), we have a big responsibility, of course.
"Everything was under control and in the end we gave goals away. It's more (on) us than other people."