@ simone
I’m sorry is not what I thought it was … it looks like someone has modified an old version of Connections. I do not know if these modifications are cosmetic or something far more extensive/substantial. The admin add/edit page definitely appears broke. How broke, I do not know. The directory on the site’s frontend seems to work fine as well as submitting entries on the site’s frontend seems to work fine so that’s good… maybe, just maybe, that means the changes were not extensive.
My suggestion, get in touch with whomever you had modify Connections and have them make the necessary changes to get the admin add/edit entry page working again since their should familiar with the changes they made. Hopefully they can make the necessary modifications.
I can probably fix it too but this would be outside the scope of normal support since I would be fixing a customized version of Connections. This would entail a service fee. I can provide a quote but I would need FTP access in order to evaluate the extent of the changes and what it would take to fix the issue.
