No worries… here is something to consider before you start doing too much with the theme options, such as colours etc….If you think at any time down the road that you will be making theme file modifications, it’s best to install the child theme that comes with the theme and install that and activate it. This way, when you make changes and modifications, you don’t lose them whenever there are theme updates. Also, if you are changing a style of something such as what was explained above, can be done with the child theme method too.
However, if you only plan to make changes to styles only (not making modifications to the structure or moving code around), then installing a CSS edit plugin (a plugin that lets you make changes to the styles of the theme without touching the actual theme stylesheet) is a good choice.
As for support…if there is something specific you need to make changes to but not sure what it is or where to find it in the theme, you are covered by support. The only thing that isn’t covered is if you need detailed tutorials or custom coding done to your theme by Styled Themes.
So with that being said, you asked about font size..etc. Was there something specific that you wanted to change relating to the font size? If so, probably best to start a new topic in the Celestial Reloaded forum category for the font question, and I will see what I can do to help you out.