Unblock permissions to my website

I have a website built with [login to view URL] programmer gave me access to it through some kind of extranet he built where i can edit information that i usually need to change, like pictures, text. He also gave me the access to see it through FTP and supposedly to be able to change any urgent thing which i do not need that often. He was very worried i was gonna mess it up so it seems like he block permissions to change them. I now need to change our phone number and i cannot. I have not been able to get it touch with him and i cannot wait any longer. I do not want only to change the number but also to be able to change anything with anyone. Is it possible to unblock it somehow or does he needs to do it?