To add your profile photo, touch the generic user profile image near the top of your app homepage to bring up the edit page. When that page comes up, touch the white pencil icon on the upper right-hand side of the page to add a new profile image.
You will then be able to choose to either take a photo or add an image from your phone’s library. Once you find the image that you would like to use, click on it to finish adding it as your new profile photo.