Here are the steps for posting a profile picture:
1. Click the camera icon in the lower right corner of the default profile image.
2. Click 'choose from photos' if you'd like to use a photo you've already uploaded to a pinboard and select the photo you prefer.
3. Click 'upload photo' if you'd like to browse your computer or phone for the photo up'd like to upload.
4. Once you've found the photo you wish to upload, click 'open' and then the photo should appear.