Sincerely and from the heart. Doesn't matter if you even say anything out loud, He can read your thoughts. He knows when you're lying, which is why He knows we're all sinners. He's seen the past and the future, all in the blink of an eye... And yet, gives us a chance to repent anyway?
We don't deserve to be loved like that. But there it is, Jesus dying for our sins, and people reject it because of what liars have done in the name of Christ.
19 Every tree that bringeth not forth good fruit is hewn down, and cast into the fire.
20 Wherefore by their fruits ye shall know them.
21 Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven.
22 Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils? and in thy name done many wonderful works?
23 And then will I profess unto them, I never knew you: depart from me, ye that work iniquity.
Don't listen to people on how to pray! There's no specific template. I mean, Jesus gave us a *type* of prayer to follow, but He didn't mean that we should pray it word for word as if it were a chant of some type. The name of Jesus Christ isn't a magic word that gets you out of trouble.
It's a precious name, used with care and respect, concern and love. Our God died for our sins. He died for the sins of His own creation.
So just talk to Him, as if He were standing right next to you. He's listening, and He wants you to get to know Him.