.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.