If you need support from Yola please contact us via firstname.lastname@example.org or make use of our live chat service! We are working on a new approach to community-based support and during this transition period we are not adding any new threads to this forum. Many thanks to everyone who has participated over the years and we look forward to unveiling a new peer-to-peer support system soon!
The content of your site and the ability to customize it is not in any way affected by your domain name. You can easily do the same things with your yolasite subdomain!
You can add HTML code but you can't upload full CSS style sheets. If you could explain a bit more about what you are trying to accomplish with customized CSS I will do my best to point you in the right direction!