Forgivness

How do you forgive? Do you just say it? Everyone has heard the term forgive and forget, but is that really what we should do? God doesn't forget our sins he chooses not to remember them.When we forgive we need to truly forgive. Forgiving by first the heart then choosing not to bring it up again. Do you forgive like this? Matthew 5:44
But I tell you, Love your enemies and pray for those who persecute you,