With the new profile design from Twitter the covers photo has been rolled out in much in the same way as facebook and google+. You can add yours in 5 easy steps
Step 1: Log in to your Twitter account click on the cog icon in the top right corner. From the drop-down menu, select “Settings”
Step 2: On the following screen, on the left will be the menu options. Select “Design”.
Step 3: Scroll down to “Customize your own” then select “Change header”.
Step 4: Upload your image from the dialogue box and simply drag the photo into positioning, if required use the zoom tools for better positioning .
Step 5: Muy bien, sit back and enjoy your handiwork!