Changing my Domain in Worpress and Cpanel

Hello,

I have an issue with my website directory.
My one directory is vapes.co.za and the other is vapes.co.za/site1
Both of these have different construction pages.

I want to know how to move ‘/site’ to just vapes.co.za

I’ve tried going into wordpress and changing the URLS there but nothing works.

I would think it will have to be changed in the file manager (Cpanel) but i dont know where to start?

Please link a page/video or instructions will do ??

Thank you in advance
Byron