Twitter enables the addition of photos in two places: your tweets and your profile. Click the Add Photo icon on your Home timeline to add photos to your tweets. Visit your Profile page to add a new profile or header photo.
Add Photos to Tweets
Step 1
Sign in to your account using the Twitter homepage and click the Home tab.
Video of the Day
Step 2
Click your mouse in the What's Happening text box and enter your tweet.
Step 3
Click the Add Photo icon located below the What's Happening box.
Step 4
Select the photo you want to tweet.
Step 5
Click the Tweet button to tweet your message.
Add Photos to Your Profile
Step 1
Click your profile picture in the top corner of any Twitter page and select View Profile on the drop-down menu.
Step 2
Click the Edit Profile button on your Profile page.
Step 3
Click either Change Your Profile Photo or Change Your Header Photo depending on which image you want to change.
Step 4
Select Upload Photo and choose your new photo.
Step 5
Click the Save Changes button when you're finished.