Replace the foods you eat now with healthier foods. Doing small things like if you are ordering a burger, don't have it with fries and coke, instead with a banana and water.

Doing things like taking the stairs, instead of the elevator. Make your life more manual.

Don't think of it as losing weight. Think of it as a weight maintenance. Once you lose the pounds, it doesn't end there. You have to maintain it.

A combination of cardio and weight training will do wonders as well. But you gotta find exercise you enjoy. Otherwise you won't stick to it.