Foreskin Retraction.

Hello, I'm 18 years old and I still have not retracted my foreskin behind my penis head. I've meet someone and I think we might actually have a good relationship in the future so I want to be prepared just in case. Anyway does anyone have any methods on how to retract my foreskin? I've heard that using soap and warm water works well but I've also heard that soap can damage some of skin inside of your penis. I'm not sure how I should retract my penis and I don't want to get any sort of operation on my penis. So if anyone has any helpful guides for foreskin retraction could you post them here or if you're uncircumcised can you tell me how you retracted your penis and how many times I should do it etc.. Thanks.