How can I achieve this? *Weight gain question*?!

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Calculate how many calories you need to consume per day to gain weight. Add at least 500 calories per day to your daily requirement. If you need 2300 calories a day to maintain your current weight, strive to consume 2800 calories daily [2]. If you engage in any physical activity, add more calories to account for the calories burned through physical activity. For instance, a 130 lb. person who does 30 minutes of vigorous weight training burns approximately 180 calories.[3] On that day, he or she should consume 500 + 180 calories in addition to the daily requirement calculated in the previous step.3Change your eating habits. Aim for three large meals and 2-3 hefty snacks per day.[4] Drink shakes, milk, or juice instead of water, coffee, tea, or diet soda.[4] Focus on the following foods:


Breads - hearty and dense (whole wheat, oat bran, pumpernickel, rye) are more nutritious than white bread; cut thick slices and spread generously with peanut butter, jam, honey, hummus, or cream cheese.
Vegetables - look for starchy vegetables (potatoes, peas, corns, carrots, winter squash, beets) versus watery vegetables (broccoli, cauliflower, zucchini, green beans, cucumbers).
Fruit - choose dense fruit (bananas, pears, apples, pineapple, dried fruit) over watery fruit (oranges, peaches, plums, berries, watermelon).
Soups - Go for hearty cream soups instead of broth-based soups. If you have trouble with edema or high blood pressure you may want to avoid all store-bought soup.
Added oils - in cooking, add a generous amount of oil. The healthiest oils are unrefined (extra virgin) oils such as olive, coconut, canola, palm, and of course butter. The less healthy but still acceptable sources of oil are those high in omega-6 fatty acids (pro-inflammatory) such as safflower, sunflower, and peanut oils. The unhealthy oils are those containing trans fat such as shortening, and the anti-nutrient-rich soybean oil (aka vegetable oil).
Spreads! - Spreading delicious calorie-rich toppings on toast, crackers, pita, and any other carbohydrate source is an excellent way to increase caloric intake. Some good high-calorie spreads are guacamole, olive oil, cream cheese, hummus, butter, nut butters, sour cream, cheese slices, mayonnaise. Even better is to mix these with shredded meats like chicken or fish.
4Avoid unhealthy, high-calorie foods. Most important is to avoid trans fats, which increase your risk for disease. Foods that are high in trans fats are: pastry products, cakes, cookies, processed meats, margarine, shortening, and packaged snack foods. [5]5Weight train. This will not only help convert the additional calories into muscle rather than fat, but it will also stimulate your appetite. The added muscle will increase your metabolism, so you'll need to consume more calories per day to maintain that weight. During the first month of weight training, you may experience tremendous gains if you are faithful to your schedule. However, also expect this to level off after this initiatory period (This is known in the bodybuilding world as a plateau). You overcome this by re-evaluating your weight and muscle mass, while altering your diet to include more food and heavier weights.6Eat more protein. Protein is essential for body function to build and repair muscle tissue. If you don't consume enough protein from raw foods or protein supplements then gaining weight and building muscle will be unachievable. Those looking to gain weight should consume at least 1 gram of quality protein per pound of body weight.7Add nuts to your diet. Nuts are a very convenient and a healthy snack so carry containers of nuts with you to snack on throughout the days. Also Goat Milk is healthy and a good way to gain weight