Happy New Year and congrats on taking the first step to reaching a healthier you! I used to have the same problem, needing to gain weight - as some people told me then, 'be careful what you ask for because you might get it' and they were right - I did gain but once it started, it didn't stop!!
I agree with previous poster who suggested you might benefit from seeing a doctor in case there is something wrong. But whether wanting to gain or lose weight, or simply maintain, this is a good place for information!!
So I'm glad you're getting active with SparkPeople - it's a great community, wonderful resources and fantastic support.
Please check out the SparkTeams - I think you will find a lot of others 'just like you' there. You can choose SparkTeams by age group, lifestyle or interests, geographic location or several other ways - in fact, I suggest joining more than one group, post your intro there and write blogs as often as you can - you will find tons of friends and support that way, I promise!!
In my experience, SparkPeople is like a in some ways - it's lots of fun and easy to make friends because we're all in this together. I like the way a HEALTHY LIFESTYLE is emphasized instead of a 'quick fix wonder diet' - it's about waaaaaay more than 'just' losing weight so you have definitely come to the right place!
If you ever need any help using features of the site, there are tutorial videos under the HELP section that can show you how to use the features of the site. You can also find them on the START page and several other places on the site.
If you haven't discovered The Spark book and/or the SparkDiet linked at the bottom of the START page, check them out - the program is simple but extremely effective. There is a TON of information on this site - so much it might even seem overwhelming but fortunately we don't have to 'digest' everything at once! The FastBreak program is a good way to start.
Another nice thing about SparkPeople is that we have permission to be human - we don't have to change everything at once or be in a hurry to reach our goals. Take a few baby steps and then a few more and before you know it, you'll have completed a long journey - I hope you enjoy this community as much as I do - it teaches us how to make positive lifetime changes because that's the only thing that will work over time!
Has a physician told you that you need to gain? There are a few medical problems that can be related to being under-weight, including diabetes and some thyroid issues. What do your relatives look like? You may have inherited an extremely lean body.
By tracking your food, you will be able to determine how many calories you are eating. One of my relatives kept track of this info and the amount of exercise to give to the doctor to help evaluate an obesity issue.
What ever your issues, you need to eat healthy nutritious food. I have known some very lean people who had problems with their cholesterol and high blood pressure as they got older.
Doing some strength training and building endurance will help with your overall health.