I am working on a new design, I can save it as I work on it, but I want to see it before publishing, and I don't see that option.
Woking on the design indicating header text and color, logo and other elements are all done but my home page has a lot of information and images that are not part of the design and I need to see the entire new look before publishing, How can I do this??

Are you changing to Responsive or just to one of the older classic designs?

The best way to play with Responsive options is to create a NEW free with ads site. For classic, all you need to do is switch to the new style.

Classic is easy to change back and forth. Just activate the design. Responsive has a few bugs where you may have to redo a lot of work.

The main thing you need to modify for Responsive are the fixed width images. They will be a bit too small for the wider Responsive designs. The width should be a PERCENT, not a fixed value.