Support

Your administrator section asks me for a username and password before I can see the login page. Apparently, you have used the administrator password protection feature of Admin Tools. Besides linking you to that page which also describes how to unset it, I don't know how else can I help you due to lack of adequate information to understand what the problem is.

When posting a support request please remember that I am trying to understand what the problem is with your site, on your host's server without having access to the site. Unless you provide me with enough information so that I can start making even a remote sense of what might be going on, the possibility of having me give you a solution is close to zero. Please give me more information. What does "unable to access" means? Is it the password prompt? Do you get a blank page or an error message after supplying this username and password? Something different? Help me help you :)

It is. Read the linked documentation page and you'll see how I concluded that this Admin Tools' feature was used ;)

It's also a standard feature of cPanel, Plesk and other hosting control panel software - they call it directory password protection. Just a side note, in case someone accidentally password protects the wrong directory through the hosting control panel ;)