Webinator's administrative interface is a web application that you access using your web browser. Access it using the URL that was given to you during installation. It will be something like:
Where YOURSERVER is the hostname, and possibly the port number, used to access the web server where Webinator is installed.
The cgi-bin and scripts portions refer to the CGI directory you specified during installation. The examples given above are the most common. Your path could be different.
texis and texis.exe are the names of the Texis Web Script interpreter and is a program that resides in your CGI directory. It is not a directory.
The portion after texis, /webinator/dowalk, is a "virtual" path indicating the location of the administrative script relative to your installation's ScriptRoot directory. ScriptRoot is the texis/scripts subdir of your install, so /webinator/dowalk in the URL is referring to the file texis/scripts/webinator/dowalk under your install dir. This is the administrative script that controls Webinator.
When you run the administrative interface you will be asked for the login and password. By default there is one login name. It is webinator in all lowercase. If no other accounts have been added, you will not have to enter the name. It will be filled in for you. Your login will be remembered in a cookie until you logout. This way, you don't need to enter the password every time you enter.
Note: If you share your computer with others, or it is available to people who should not be administering Webinator, then you should logout when you are finished. This will help prevent unauthorized configuration.