First, log in to International-Dating-Portal (see also: How do I log in?). In the Community Menu section select the View Your Profile button, then the Update Your Profile button and then the Portrait tab. Using the Photo selection field, you have the option of leaving the existing portrait as is (select: No change of image) or upload a new portrait photo (select: Upload new image). Because the profile photo is mandatory, it can only be replaced, but not deleted (see also: Why do I still see the symbol of a clock instead of the picture I uploaded?).