You can input time manually later on if yuo forgot to click the player:
Click on your serurce button (and then "addTime" ).
The add time popup will show up. In the simple version you only have to choose the date and the amount of time. You will be able to add up to 24h per day.
If you need more detail you can click the "Need more details?" link.
If you click the ""Need more details lick the popup will change to the detailed input tipe.
Here you can specify the start time and the end time and input time in hours/minutes/seconds.
To save the time ckick the green check on the lower right of the popup.
If you want to add multiple times click the "Save and new" button. Remember to double check the date you want to add time to.
Be aware that you can only add time to your self. Everyone els must add time by him/her self.