Site down: failed to open stream

I’m an amateur here… I was messing about in settings Sunday and I think I changed the web address from what was https://benreimer.com TO https://www.benreimer.com… I don’t know why i did this. Again, total amateur. Site now says the following, and I can’t even get to the dashboard or anything to even let me log back in and fix. Just get the following:

Warning: Unknown: failed to open stream: No such file or directory in Unknown on line 0

Fatal error: Unknown: Failed opening required ‘/nfs/c07/h01/mnt/99343/domains/benreimer.com/html/wordfence-waf.php’ (include_path=’.:/usr/local/php-5.6.21/share/pear’) in Unknown on line 0

PLEASE ADVISE. b

The page I need help with: [log in to see the link]