Yuo should always take a backup before adding anything to the site, mods or edits.
If it is not that far along, maybe just start over. If it is far along, I would post in the General Discussion Forum,
https://vborg.vbsupport.ru/forumdisplay.php?f=251
And state what you did from start to finish that broke the site, and include the error logs, and maybe someone can help you out.