Welcome to the forum @Savelugu_MEO_GES and thanks for adding your profile picture. It helps build community! We're glad you're here. When you get a chance, please introduce yourself on this forum thread.
How is your website hosted? In addition to a domain name (which you have) you will also need a server to run the Central software. The documentation has the full instructions: https://docs.getodk.org/central-install/ - it sounds like you have completed the first step of Getting a Web Address (Domain Name).