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!
You would need to change the banner image in the sitebuilder.
The site you built will always be available in your Yola account for editing and updating even if you download your site as a zipped file and host it elsewhere. However, to put your changes live you would need to re-download your site and re-upload it to the servers of your hosting provider each time.
If you host your site with us (either using a free subdomain or a domain of your own) you can update it with a single click - so it is a lot easier to make changes.