Answer:
First, you need to click your avatar, if you click the one that on the top right, you will see this you need to click view profile, then this will appear, you need to click edit profile, then this will appear, then you need to click the one that I circle, you will see the word that named edit after profile picture in the circle, after you click it, this will appear, click the button that I circle, the smallest one, you need to choose the picture that you want after you click it, after you chose \, you need to click this button, then you finished.
