I will change the theme at the http://www.asianprobiz with another theme from my file (wp content, theme), but I don't know how.
i THINK what you mean is that you downloaded a theme (in a directory, not a file) and don't know what to do with it.
Upload the new them (unzipped) into your wp-content/themes directory. Then go to admin->presentation and activate your new theme.
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