How to lose weight without a gym membership?

I'm 15 and weigh 140 lbs. I dont care how long it takes but I would just like to know, if any one could help me loose weight. Doesnt matter what plan just as long as itdoesnt cast gtm membership. I already have a bycicle thing machine that works...

legs. But I would like to get nice abs...PLEASE HELP!

 
You don't say how tall you are so we can't figure out what your weight range should be. Go to the link below to see what weight range you should be:

 
Average Teenager Weight

http://lifestyle.iloveindia.com/lounge/average-teenager-weight-236.html

 
As far as losing weight:

 
How can I Lose 1 pound of body weight per week?

 
One pound of body fat is equal to about 3500 calories. So to lose 1 pound of weight per week, you need to eat 500 calories/day LESS than you burn.

But it's not a good idea to lose weight simply by cutting calories. As well as decreasing calories you should increase your daily physical exercise. This helps to burn calories and build more lean tissue which in turn burns more calories.

 
What should a minimum calorie intake be?

As a guide to minimum calorie intake, the American College of Sports Medicine (ACSM) recommends that calorie levels never drop below 1200 calories per day for women or 1800 calories per day for men. Even these calorie levels are quite low.

http://www.bmi-calculator.net/bmr-calculator/harris-benedict-equation/calorie-intake-to-lose-weight.php

(If it's not an active link then simply copy and paste it into your browser's Address box.)

Funmail me for lots of info if you'd like.