Confusion Around Relume Style Guides and Color Variables

I’m still a bit confused with the new Style Guides (actually haven’t used Relume before but there is just very little documentation for the new stuff). For example I want to change the following colours:

background-color-secondary
background-color-tertiary
background-color-alternative

But I can’t see them anywhere in the Style Guide nor do they seem to appear in the variables. I read through a few bits here: https://www.relume.io/whats-new/january-component-day & https://finsweet.com/client-first/docs/utility-class-systems But still stuck on how to actually ensure everything is covered as expected. I went into the Stlye Guide but under ‘Colors’ there is just the standard Scheme 1 without anything really to edit beyond the standard colours. I found this thread that promises some more documentation on the subject but its 5 month old and I don’t think this was actually realised. https://community.relume.io/x/issues/0zxd9wswdgcf/concerns-about-new-color-variable-structure-in-sta