Who do I ask to have my profile and login deleted please?

I’ve finished using this site, and would like my account removed (particularly as I have to enter my password on an insecure site ( http://www.esa-sen2agri.org/wp-login.php?6xi5pu5hsjs5zy5hfzxcuo4vlm=m4fvdeyyk4k7i7fk3fbdz5yupa ). How do I request for that to happen please? I can’t see anything under my profile?

Many thanks! Kevin