If you want to edit a theme, normally you would use the style.css file and possibly header.php and footer.php.
Unless you have a theme that makes editing easy like Flexibility and others it is not necessarily a good path for a beginner.
Thanks for help , but is it easy to do that?
I think that I need to read more about that , is there any article I can read it to help me doing that?
about my previous question do I have an intro.html in my theme folder?
where it come from?
thanks for help
do I have an intro.html in my theme folder
If you can’t see it you most likely do not. Some themes have a readme.html or the like to tell you how to install the theme. You theme could have used an intro.html. What theme is it?
You can start your reading here, http://codex.ww.wp.xz.cn/Main_Page
If you just want to take a theme and run with-it it is easy. The more you wnat to change the more dificult it is. That is why you pick a theme very close to what you want as far as sidebar, size, etc.
Thanks for help you are so helpful,that is very kind of you.
Moataz