Get a medical checkup first.
Find out what's stopping you from losing weight.
If there's nothing wrong, just eat less... and spend less time on your pc.

To lose weight, you need to follow these steps,
First of all, you should eat 3 meals a day. But the portions will always be half.
Meals will be less salty and less oily.
Yogurt or kefir will definitely be drunk between meals. Dinner should be eaten at 18:00 at the latest.
Only liquid replenishment can be taken until breakfast.
Salad must be consumed at every meal (with vinegar and plenty of lemon).