From your 'My Hub' page (please see below)
If you go to the 'Menu' icon in the top right...
then select 'Settings' from the options
If you click 'Customisation' tab from the 3 options at the top of your page
You will be able to upload your logo within your account and change your colour scheme which all clients will see on their side too!
Just remember to hit the 'Update' button to save the changes.