United battled through their opening game of Group H with Pogba scoring twice and setting up the third for Anthony Martial as Jose Mourinho's side made a confident start.
But the midfielder says he had made a promise to his coach that he would not repeat the mistakes of his only penalty miss so far for the Red Devils, and subsequently made it four goals out of five attempts from the spot.
"I had no doubt about taking the penalty," he told the MUTV.
"I know I missed that one [against Burnley], but I told [Mourinho] I won't do the same mistake this time.
"I had the confidence of the players as well, they let me take it too, so I thank them for this and I thank the manager.
"The most important thing was to put the ball in and that's what happened, so I'm happy."
"We started with three points, that's the most important thing," he added.
"We know that we have the bigger teams coming up and we're going to have to get the result we want, because we are playing in the Champions League and it's for top teams only.
"Obviously it's not going to be easy, but we've got to get through this group."