Login to Conrad Connect. Click on your current avatar and then in the section 'Profile picture' on 'Upload'. Click on the left to select a picture to be uploaded. After choosing the preferred cutout of the picture, click on 'save'.
If you would like other people to see your profile picture, e.g. in your published projects, activate the slider 'My profile picture is public'.
The button 'Delete' allows you to delete your profile picture.