How to place a profile photo or to change an avatar?

How to place a profile pic or to change an avatar?Anybody there??Well, I am just a novice to this kind of interest,however it made me wonder how to place a picture on it. I have tried thrice but got nothing in there? I don't know about this "mylot" thing yet. But I am liking this these days. It catches my attention,huh. So, any procedure or whatever?I wanna know because I am excited to place my photo in there.*wink*. What I am up to is that to have a face in here. I don't feel like posting if I have nothing on my avatar. It feels like i don't exist. hehehe..Well, looking forward to your responses!Thank you and have a good time!:)