Adding a manual time log is really easy (like shown in the animation below).
1. Start by entering time spent in the new-entry sections (first row).
2. Complete description of the task accomplished.
3. Set project. Be aware that only projects with active booking appear (based on selected date).
4. Set type (regular, weekends, vacations, etc.)
5. Click on "Add" button to confirm.
Afterwards, the effective time log will appear below the new-entry section, you may repeat the process multiple times.
Please notice that as you enter time logs, the navigation bar will reflect a number of hours entered by day, week and month.