Hello,
I would like to add/modify the design of this portal, and what I want to achieve is the following:
- I want to change the color of the navigation from black to blue.
- I want to add a company logo to this navigation.

- I want to add another logo in the right of the text "Sign in with a local account". Take a look at the screenshot below:

- I want to change the following photo posted below in the "Get Help" section.

Can please someone explains in detail and provides an example to achieve the following requirements mentioned above for the Customer Self-Service Portal?
Any help will be greatly appreciated.
Thank you.