1. Spend more time around people. If you want to make friends, you first need to put yourself out there somehow. Friends seldom come knocking on your door while you sit at home watching TV.
2. Talk to people. You can join a club, go to school, or go to church, and you still won't make friends if you don't actually talk to people. By the same token, you don't have to be involved with an organization to talk to people, and any time you talk to someone, you have a chance at making a lasting friend. You can talk to anybody: the clerk at the video store, the person sitting next to you on the bus, or the person in front of you on the lunch line. Don't be too picky. Most conversations will be a dead-end of sorts---when you may never talk to that person again, or you just remain acquaintances--but once in a while you'll actually make a friend.
3. Introduce yourself towards the end of the conversation. It can be as simple as saying "Oh, by the way, my name is...". Onece you introduce yourself, the other person will typically do the same. Remember his or her name.
4. Initiate a get-together. You can chat your heart out but it won't get you a friend if you don't open up the opportunity for another conversation or meeting. This is especially important if you meet someone who you aren't otherwise likely to meet again. Seize the day!
5. Be a good friend. Once you've started spending time with potential friends, remember to do your part (i.e. initiating some of the activities, remebering birthdays, asking how the other person is feeling) or else the friendship will become unbalanced and an uneasiness or distance is likely to arise.
6. Choose your friends wisely. As you be friend more people, you may find that some are easier to get along with than others. While you always give people the benefit of the doubt, sometimes you realize that certain friendship are unhealthy, such as if a person is obsessively needy or controlling towards you, constantly critical, or introducing dangers or threats into your life. If this is the case, ease your way out of the friendship as gracefully as possible. Preoccupy yourself with other things, such as a new volunteer opportunity, so that you can honestly say that you don't have enough time in your schedule to spend time with them (but don't subtitute their time for time with other friends; they may notice and become jealous, and more drama will ensue). Cherish those friends you make who are a positive influence in your life, and do your best to be a positive influence in theirs.