Desktop Browsers:
At the top right corner under “Profile”, click on the link “Edit Profile Picture“. You are now on the right page. Upload a photo, crop image and save avatar.

Mobile phone browsers/app:
Unfortunately this part is a bit “tricky”. Simply upload a photo, either as a post on Home page or from the module Photo. Open the left side menu (three green bars at the top left corner), then go to “Photo”. An the top right corner of the display you can see two arrowheads pointing down, tap them and choose “My Photos” from the menu. You can see the newly uploaded photo. Now tap the photo and then open the menu “Actions”. Choose the option “Make profile picture”! You do not have to do anything on the page that follows! Your profile picture is already stored. Creating cropped image can be currently made only via Desktop Browser.