content

Try editing style.css and changing:

#content {
    margin: 0 280px 0 20px;
}

to:

#content {
    margin: 0 100px 0 20px;
}

and adding:

#access .menu-header, div.menu {
    position: absolute;
    top: 125px;
}

to the bottom of the stylesheet. But be warned that all of your changes will be over-written the next time you upgrade WordPress or the theme. For this reason, it is recommended that you consider creating a child theme for your customisations.

Remember to press CTRL and F5 simultaneously when viewing an updated page/site. Or try emptying your browser cache. This should ensure that your web browser fetches a fresh copy of the page rather than serving up an out-dated copy from your own cache.

Also disable/deactivate any caching plugin(s).

how do we disable/deactivate the caching plugin(s)

If you are using any caching plugins, you’ll need to refer to the documentation for your particular plugin.

I can’t see anything on the left hand side of your site.

You need to edit your theme’s stylesheet & change the link colors:

a:link {
    color: #0066CC;
}
a:visited {
    color: #743399;
}