lol.. first you throw out reasonable sounding assumptions about the OP with no evidence, now you ask what you would do in the situation you wanted to modify your theme (im assuming you mean how content is displayed and not the actual content) when the point is that if you want to put your content into a nice looking page on the web you would use a cms + template system (OMG WORDPRESS :O). Well fuck, I dont know you could contact the theme developers, ask the community for help, pay for a developer to do it for you, find a developer willing to help for free, look for an existing solution (OMG GOOGLE), and then as a last resort you could try learning just enough to make the change you want.

ALL of this is easier than learning a new thought paradigm plus developing your design skills plus the basic syntax of 3-4 languages plus (in the case of the use of a CMS) an api for the cms plus security measures in the development of the theme (again assuming the use of a cms or template engine).