Lil' Old Newbie close to a nervous breakdown

Hello, I apologise in advance for my low level of expertise in php and js.

I work for a charity and we have had a large funding cut, so we had to make savings where we could. As the Administrator, I volunteered to migrate our website from a managed Drupal-driven website to a hosted server with cPanel and Softaculous, which I have already done for another charity.

I got the site up and running failrly easily and installed the excellent CK editor and CK finder and loved them. The real problems began after I installed the WP Security plugin, which strongly advised changing the prefix of the wordpress databases... which broke our site.

A complete reinstall later, I had the site more or less working again, but , instead of teh WP installation being in root (which is where the hosting company had installed it at the time of purchase) Softaculous asks for a subdirectory to install to.

Now, while CK editor works fine, CK Finder does not appear to recognise my WP Administrator role (set in the CK Editor panel in WP as the only role authorised to use CK Finder), coming up with the message "The file browser is disabled for security reasons.... " etc.

I have been through your replies to other posts about this and tried everything suggested in them, Wictor, but I am afraid nothing you suggested worked and I simply don't know that I can try the 'cookies' workaround that WebDude discussed, back in 2008.

May I ask what I should enter where to make this section work?

function CheckAuthentication()
{
global $ckeditor_wordpress;
return $ckeditor_wordpress->file_browser == 'ckfinder' && current_user_can('ckeditor_ckfinder_access');
}

I really have tried everything, else I would not bother you.

Thank you so much for your time. I really appreciate your patience.

Best regards.

Toni