In order to add project time manually, go to "Recording" (Marker 1), in the tab "Project Time" (Marker 2). Click now on the button "Add Project Time" (Markierung 3).
Choose the task (Marker 1) for which you want to track time afterwards and insert a short note (Marker 2) for this project time entry. timr suggests you always automatically to add 30 minutes. The start/end date and the start time are always the end date and the end time of the last tracked project time entry. You can edit the date and time (Marker 3) and the duration (Marker 5) is calculated automatically. Insert a break (Marker 4), define if this project time is billable (Marker 6) and click "Save" (Marker 7).
You can enter the time and the duration in almost any form. You find all related details in the guide about time and date format.