Go to your Profile in the top right hand corner.
Click Settings and scroll down to Customization and Profile Picture
We recommend you to upload your profile picture in a 1:1 format. Those who upload the picture with a ratio of 4:3 or 3:2 will experience a strange look, as it may end upside down /aside. The minimum size is 110 x 110 pixels. If larger, we'll automatically reduce it.