Upload Logo File
To set your company logo, go to Administration | Theming and scroll down to the Logo / Login Page Logo section. Click Choose File and browse for the image.
Logo - for notifications, dashboard
Login Page Logo - for the login page only
To add logos to your workflow, you can do so via the content library.
Note: TAP will only accept logos in .png image format and the image must be smaller than 250x80 pixels