The Bible says:-
“If we say that we have no sin, we deceive ourselves, and the truth is not in us, If we confess our sins, he is faithful and just to forgive us our sins, and to cleans us from all unrighteousness.” (1 John 1 v 8-9)
“That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.” (Romans 10 v 9)
Simply bow your head and pray:-
I am a sinner. I cannot save myself.
I know according to your Word, that I cannot make myself righteous.
I thank you, because you love me, and you sent the Lord Jesus Christ to die for me.
Through his righteousness, redemption is made available to me.
I believe that Jesus died for my sins according to the scripture.
I believe that he was raised from the dead and is my justification.
I confess Jesus now, and proclaim him as my saviour.