Option to centralise the dropdown menu content

Please accept my apologies if this has been asked before however I cannot see another thread with this question.
I am simply looking at getting the content of my drop down menu to be centered but am failing on every attemp.

Would you please be so kind as to offer some form of instruction.

Thanks in advance!

Hi Charliealpha,
Thanks for contacting us and choosing our product!,
You can refer to our documents.
docs.joomlaux.com/extensions/jux_css3_megamenu/
If that can not be helped you, please send us the site and back-end accounts at private message. we will check for you, Thanks
***************
Best Regards
--NT--