How can I do that with MT. I don’t see any CSS settings to center horizontally. I try adding large amount of equal padding to the left and right, but that doesn’t work.
In your theme you have the nav container with the class gdlr-navigation – if you double click the menu container then using the Targeting and Inspector tabs on the right focus in on that class:
.gdlr-navigation
Create a selector for it, then in the editing bar select the text icon. Text-align is available under that selector.
For adding manual code, in the upper right of the toolbar there’s an icon <> – click that to open the code editor.