To register working time on a selected project, you must first register the working hours on a given day.
After recording the working time, a list of assigned projects will appear. Expand it and select a specific project, and then mark how many hours you spent on it.
Click the plus icon to add working hours.
Working hours dedicated to working on a project are shown below the day. You can edit or delete them at any time. To add more, repeat this step.