Hi Felipe,
Mainly, Bluishost is a WordPress Theme
and we are providing the WHMCS template for FREE of cost with the Theme by customizing WHMCS default six template's header, footer, and color based on our WordPress Theme.
Without the header, footer, and color there is no relation to the WHMCS template with the WordPress Theme. Because both are totally different systems. One is a WordPress theme and another is a WHMCS template. We also showed the WHMCS demo to see how it looks like.
In this case, you need to use both WordPress Theme and WHMCS templates separately. WordPress Theme to show/represent your products/services and WHMCS template for billing like as our demo.
Best Regards,
ThemeLooks Support Team