There is a link at the top of every blurter's page that says "add as friend"..click on it if you want to request their friendship and wait and see if they respond. If you already have someone as a friend, you will not be able to see this "link".
Hmm if I really want to be friend with someone.. I ask them if I can be their friend.. And would spend time with them.. And just be me.. And if it won't work for some differences, maybe we aren't good as friends..