1. Props are rewards given by other Fanpop members for your contributions. Say you added a good video, someone might give you a prop for videos, or if you answered a question well you could get a prop for answers.
However, people also give props randomly, just stuck onto wall messages saying "hi" or "thanks for the add". People also give props as rewards for winning competitions.
2. To give someone a prop, you first go to their profile and scroll down the page til you reach the end. There, you can post a message on their wall. You write whatever you want to write in the white box - no one can give a prop without a message - and click on the second little image box beneath it then select the prop category you want. Then you just click Post.
Ok there are two parts to this question.
1)To send props you go to the person you want to props page and click on props. A small text window will answer and you type what you want.
2)Props are many things; People use them to keep in touch with friends...others use them to complament others on their pictures, their stories, etc.