te go to your profilo and click on photos. Once there te can carica the foto te want. Then, below the uploaded image, there are three icons. One of which is a teeny person which is make the image your profilo picture. Click it and that foto will become your profilo picture. te can also make it your profilo picture by, as your uploading, clicking the "make this image my profilo picture" box and then it will change your profilo picture once the foto is uploaded.