To add a photo to your profile or change the existing one, select Options on the left side and click on the User Profile tab. From here you can either click on the existing picture or on the pencil icon above the image.
A dialogue box will open, prompting you to choose an image from your computer. When you have selected an image, click Open.
Your new profile picture is now saved, and your contacts will see this picture when they are communicating with you through TitanFile.