How to change the profile picture?

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I saw that another member has the same profile picture and I want to change mine. It those not make me feel uncomfortable but I those make me feel a little bit confused since I do go on my profile picture to know if I posted on a discussion. I don’t normally have to check if I posted on a discussion but I know if I see that there was a comment made by someone that has the same picture on their profile it is going to make me confused. I will like to know if someone can help and tell me what I have to do to change my profile picture. I will be really thankful I also know that it those not affect me if I have the same profile picture as someone eels. But I would like to change my profile picture any way.