Hi mehdiaman. Welcome to the Hueman forum. If you search the forum you will find many posts regarding attempts to change the sidebar widths. I think one or two address reducing the size of the primary sidebar, but I don’t believe you’ll find any posts with a solution to increase the width of the secondary sidebar. The theme is not built to accommodate that change. It uses background images and negative margins to position the sidebars and trying to change those would be a significant amount of work. And then you’d have to change the media queries to adjust the mobile views. If you can’t move your ad to the primary sidebar then you might consider looking for another theme that has an option to adjust the sidebar widths.
