Go to your profile, and click 'add image.' A prompt for 'browse' should come up- Click on that, and it'll bring up your documents. Find the saved picture you wish to upload, click okay, open, etc. Add an image caption if you want to, before clicking upload. Tick the icon box if you want to make the image your user icon. You can also change your icon to a picture you're already uploaded or edit an image you've already uploaded from your gallery.