I need to change the wordpress installation domain

hello, i have an existing WordPress installation on a free infintyfree domain and I bought a new domain and need to move my old Wordpress website with all data to the new domain , what to do?

Follow this if the new domain is added as an addon domain:

Then you’ll have to change the website URL and the home URL for your website to work under the new domain; here’s a guide to do that as well, which is also listed in the article I linked to:

what do you mean by if the new domain is added as an addon domain

For the first domain an account this is usually called htdocs/, for domains added later it’s usually something like example.com/htdocs/.

Adding to what @oxy said:

is there a video or step-by-step tutorial to do ? because I don’t understand anything

first make a backup of WP as well as DB


WP video

also you need to understand this post