Changing site URL or moving site

[Topic changed to be useful]

Hi Guys,

I need some urgent help for my website https://www.venturecouture.com.

I made the WordPress on https://www.venturecouture.com/blog but now want it to be on https://www.venturecouture.com.

My hosting company 123-Reg has changed the homepage to it but all the product categories underneath ‘SHOP’ now do not work.

Please can someone help me how to do this as I am not great with WordPress and I need to put my site live.

Thanks is advance.