If you can retract your foreskin, do it every day in the shower and run water over the penis head to clean it. When you are able to retract, you can soap up your penis as you wash the rest of your body.
In the meantime, to clean under your foreskin without retracting it, get an clean, empty shampoo bottle (or one you can squirt), fill it with warm water and squirt it under the foreskin.
Instructions for stretching the foreskin are in a sticky at the top of the Men's Health Message Board at
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