Hello,
1. Looks like there is our bug with settings. We will fix it in next theme update.
You can use this custom css code as a temporary solution:
.category-grid .categories-mask h4 {color: #f26107;}
.category-grid .categories-mask .count {color: #f2792e;}
2. Content of Shop sidebar can be changed in Appearance > Widgets. Read more – https://www.8theme.com/documentation/xstore/support/widgets-custom-widget-areas/
3. Please read our documentation – https://www.8theme.com/documentation/xstore/plugins/mail-chimp-form-custom-styles/
Edit code of the form http://prntscr.com/jcnrtq > http://prntscr.com/jcns38
4. You can activate the main theme on site, but we recommend to use the child theme. Please read – https://www.8theme.com/documentation/docs/child-theme/ https://codex.wordpress.org/Child_Themes
5. Please read our documentation – https://www.8theme.com/documentation/xstore/plugins/plugins-update/ https://www.8theme.com/documentation/docs/activation-and-purchase-codes/
Regards