How to Tweet The Tweet box expands when you click it. Or you can Tweet from the Tweet button on the navigation bar. You can add a photo to your Tweet by clicking the camera icon. To mention someone just start typing the "@" symbol and their username. "Awesome Show! Here's a pic:" You can also add your location. Click the drop down to change or add a new location. When you're done click "Tweet." Your timeline will update with your Tweet at the top.