Get a metric scale. 
My brother has had the same problem. He was always underweight. He finally gained weight by weorking out, as well as using those weight-gain suppliments.
If that doesn’t work for you, make your new motto: If It Doesn’t Move, Eat It.
I tell you what, I will send you all the food that I want to eat during the day since I am seriously dieting and that should do the trick. Everytime I want to eat, I’ll just think, “Nope, think about poor, thin Rose and how she needs this more than you do.”
::waddles off grumbling (good-naturedly) about skinny people::
Don’t listen to these lightweights. Use spooje’s special three-pronged attack.
- Donuts. They are your friends. Visit them every morning.
- Jack-in-the-box. Pay particular attention to the ‘finger foods’ and the ultimate cheesburger. Most are open 24 hours for your convenience.
- Milk. At least a gallon a week.
Unconventional, you say? Maybe, but it will work. I know this because when I stopped eating these foods I dropped 30 pounds in a couple of months.
Just wanted to mention that when I clicked on this thread, it had 22 posts and 222 views.
The health food store sells a lot of “Meal” bars like the Cliff Bar for example. They are like a candy bar with 3 times the calories! They are relitivly low in fat, so you will gain weight not flab.
If you dont like milk, make smoothies with tofu and frozen yogurt, lots of weight will be gained.
hope this helps.