This CSS should do it
.menu-main-menu-container {
/* text-align: center; */
margin: 0 auto;
display: table;
}
.td-main-menu-logo.td-logo-in-menu {
float: none;
text-align: center;
}
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To add CSS:
- If you are using WordPress 4.7, use the “Additional CSS” option in the customizer.
- If your theme has a custom CSS option, use that to add the CSS shown above.
- If not, install the plugin Simple Custom CSS.
Learn to use the Chrome Developer Tools to help you see and test changes to your CSS.
As you use a commercial theme and need support, please use their official support channel. We feel they are best equipped to support their products.
https://themeforest.net/item/newspaper/5489609/support
Commercial products are not supported in these forums. You are their customer; I am sure they will have no problem supporting you there.