Looking for some help about what to do to change my website url.

Hi !
I just take part in a non-profit organisation which aims to promote the traders and artisans of my village. We have changed the name of this organization from "Bid'art and co" to "J'achète à Bidart".
We have one website : https://bidartandco.com that we want also to change url to: jacheteabidart.fr.
!13|690x267
I am in charge of this but I don't know how to do. I already bought the domain jacheteabidart.fr. Could you help me with what I must do now, please ?

The website is managed by wordpress.

Thanks a lot !!!
Margaux