No one needs to teach anybody how to gain weight; for most people it comes naturally. Losing weight on the other hand is a feat that many find difficult to perform on their own.
When faced with doctor's orders, they try out for a while, but many give up before they get there. Don't be like such people.
It's very important to do all you can to lose weight, especially if you are concerned about your self confidence.
When you work out to lose weight, be sure to keep your family physician in the picture. There are a few things you must not do; otherwise your quest for fitness might be cut short.
Only the doctor can be clear with you on these, and you must stay within the limits of what they say.