it was described by me in Helix documentation > Faq & How to doandImage Logo - first upload logo with transparent backgr..." data-socialbacklinks="1" />

You have to use custom CSS.
Colors of menu items > it was described by me in Helix documentation > Faq & How to do
and
Image Logo - first upload logo with transparent background and white letters (png)
Text Logo - example custom CSS:

#sp-header .logo a {color: yellow !important;}

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