This is the right place for Ren'Py help. Please ask one question per thread, use a descriptive subject like 'NotFound error in option.rpy' , and include all the relevant information - especially any relevant code and traceback messages. Use the code tag to format scripts.
If you're interested in making GUI changes, I'd recommend you start be reading this guide first:
If you want variable positions - you'll probably need to create your own variables and modify the screens to read off those variables, just make sure you put those variables in your screens and not your styles - as styles are initialised once at launch and doesn't change even if variables are in them.