Navigate to twitch.tv and log into your account. Then click your profile icon in the top-right corner of the screen. 2. Click profile photo again to be taken to your settings. 3. Click “Update Profile Picture” (under the “Profile” section of your account settings). 4. Select “Upload Photo” (or “Edit Current Thumbnail” if you want to simply re-crop your existing profile photo). 5. Select the appropriate photo from your computer. 6. Crop and rotate your profile photo as desired, then hit “Save.“