Visit your settings page. After you've signed in, select the ‘Settings’ page from the drop-down menu below your profile picture. If you haven't uploaded an avatar, hover over the circle in the top-right corner of your page. If you’re using a mobile device, tap the drop-down menu from the three-lined icon in the top-right corner of your screen.
Update your picture. Click 'Change profile photo' under your current photo. Choose an image from your device or your hard drive and click 'open'. Your new choice will automatically save.
Edit your username or other profile information. Tap or click on any of the fields you wish to edit. The field you've selected will become dynamic so a 'cancel' and 'save' button will appear. Click 'save' when you've made your edits.