Logging in is possible using a built-in account or an external login provider (Facebook, Google, Microsoft, Twitter), if enabled by the site administrator. In all cases, the site administrator must send a site invitation first. This invitation includes all relevant login information.
Once an invitation is received, log in with the provided information.
If the user misplaced or lost the login password, it can be recovered using the "Forgot your password" link. An email is sent to the registered email address to reset the password.