In order to log into Foswiki, your account needs to be enabled for access. This is often done at a department level. The access list is updated once a day during early morning hours so if you request access, the next morning is the earliest the request will be completed.
You log into Foswiki with your Falcon Account username (e.g. w2600000) and password. Once logged in, you're identified within the application by your wiki username that consists of your first and last name stuck together (e.g. FreddyFalcon). This username will appear at the bottom of pages you author/edit, as well as in change logs.