Losing weight is simple, not overly easy at times, but simple enough.
What does your diet look like now?
Do you workout (much) now?
Overall, if you really wanna lose fat (& retain muscle) I highly recommend reducing your carb intake. Having (something like) 1g of carbohydrate per lb of bodyweight & 1.5g of protein per lb of body weight.
Eating 6-8 meals a day will speed up your metabolism & thus burn the fat!
One element that ya gotta do, no matter what, is do cardio. It depends on your current situation how much & how often. if your startin' out, 3 x 20 minute sessions of low intensity cardio sessions (like setting the tredmill to a speed of 5 & an incline of 2) or gentle cycling...
Hope i've given you some good food for thought