Thanks for writing in.
There are a lot of ways to add your logo in the middle but I believe that the best ways to do it is by using PRO or in your X > Theme Options > LOGO AND NAVIGATION > LAYOUT > Stacked .
Using Pro, you can manage your arrangement or position of all the elements that you want to add in your header. You can check the link below for more details about PRO builder.
Using theme options, go to your X > Theme Options > LOGO AND NAVIGATION > LAYOUT > Stacked
The theme option above will arrange your menu and logo in the middle.
Hope it helps.
Let us know how it goes.