Welcome to SP! You need to first create a SparkPage. To do that, go to your start page and click on the link for "Create Profile/SparkPage" on the right side of the page in the green My Community column. Once you do that, make sure it is set to allow friends to see it and save the page. After that is all done, they should be able to add you as a friend.
Hope that helps!
"Obstacles don't have to stop you. If you run into a wall, don't turn around and give up. Figure out how to climb it, go through it, or work around it." - Michael Jordan
Searching for a buddy? Try using the search feature in the SparkPages
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