@questas_admin:
I do not have a FTP connection or backup. I just made a manuel backup by copying all the content of the websites. Therefore I cannot access into FTP and change the name to default the theme. Is there another way to default the theme, maybe without being logged in?
@tara:
The problem is I cannot access my WP-Account. Therefore I cannot upload a new copy of the file. The main problem is that I cannot login into my WP-account anymore. If that would be possible I could fix the theme issue. Do you know how I could get access to it?
From where do I know who my Webhost is and which file management application it provides / supports?