@the-brink: Hello brink, You can use this css code to remove the underline from the ” support us” button, It will be better if you use div id for that support button so that it will be easy to provide the css code, below css code will work but it is not that right way.
Go to=> Appearance=> Customize=> Additional CSS=> add the following css code
a {
text-decoration: none;
}
To make it hover you need to make other more changes so I suggest you to hire a customizer to get it done.
let me know if this helps you out!
Kind Regards,
Sapana