It depends on what you are trying to do. Some changes are made in theme options, others in page content and others in php files. But you should never change theme files directly — but rather use a child theme — that way your changes will not be overwritten when the theme is updated.
For specific help with your theme, you’ll need to contact the theme developer or vendor – as these forums don’t support commercial themes.
Thank you friend. I want to add some external widgets. It can’t edit on the theme options.
What theme are you using and what sort of widgets are you trying to add? Typically, you can add text or images or code to the existing widgets in a theme — most all themes have some.
This has more detailed info about widgets:
http://codex.ww.wp.xz.cn/WordPress_Widgets
My theme is Splash theme. I want to add custom email subscription widget.
Looks like i can’t do it widgets option. 🙁