The user manual describes how to log time, how to plan time on task and sub-task level and how to work with your personal time sheet.
Please note that ictime has a very flexible permission management, so that there is no fixed definition of the permissions a user or an administrator has. In general, a typical user should have the permission to log time, plan time on task/sub-task level and to manage own timesheets. An administrator should have the permission to configure ictime, to use the Reporting & Analysis features and to plan time on project or component level.