Accessing the calendar
There are five different membership levels to access the calendar:
You're a guest when you're not a member of the site, or when you're not logged in.
If you're not a member and if the site is public, you may become a member by signing up. If the site isn't public and doesn't allow signing up, only the site's admin can make you a member.
If you're already a member or more, logging on will allow you to use your privileges.
You're a member of the site when you have a username and a password and when you're logged in.
Passwords are encrypted on the server, and no one (not even the server's admin) can decrypt them. So if you lose you're password, you'll have to get in touch with the site's admin who will give you a new password (that of course you'll be able to change).
All members can be set to be Contributors by the site admin. To know if you're a Contributor, look for "Add" links in any calendar view (month, week or day). If you see those links, then you're a Contributor and you can create/edit your own events.
You're a Contributor if the site's admin made you the unique contributor of this calendar, if he added you to the group of contributors, or if he chose to make all members contributors.
Editors are defined by the site's admin. A calendar may have only one Editor, or it can have a group of peoples, as editors.
The Admin is the owner of the site, or the group of people he chose as co-administrators.
If you wonder if you're an Admin, then the answer is no (you'd know!) :-)