Thanks.
I found out about the username and password through the database itself. I think the problem may be a little bit larger.
I haven’t upgraded for some years and it seems that some changes has to be done from the admin panel inside wordpress (I my be wrong). I have (today) upgraded to php 7.2 (which already is outdated) on recommendation from the web hotel. That should enable access to the admin panel where I need to upgrade plugins etc. After that I need to upgrade to php 7.4 (or may I just go directly to 7.4?).
I have forgotten most of my previous skills in WP and that is quite a hustle when I need to get back …