Usually on this apps (i haven't used that one) a floder is installed in your site. You upload the entire folder, then, you access it in your browser directly.
How is that? If you installed in your root folder, then you write in your browser:
http://www.yoursite.com/webcalendar/
I assume the folder created is called webcalendar.
And, usually too, inside that folder is another folder called "admin". So to enter as an administrator you should write the same address plus the admin floder. Something like this:
http://www.yoursite.com/webcalendar/admin/
The process should be self explanatory, but probably you will need to create a database in for your site, then in admin you will be asked for the access to that database and the app should populate it automatically.
I hope this helps
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