How to Add a new media entry:
Select a Plan.
Click on the Table sheet view (up to the left) or just press the button showing in the middle of the screen on the Calendar view.
Choose which media type in the bottom of the screen you wish to add.
Press the first row in the sheet and start enter your media data.
Press tab to jump to the next cell.
Press enter to save the data you entered.
Nice to know:
If you are missing a media type, go to settings and add a new media type under "Media Types"
Under Settings/Media Types you can delete the media types you are not using.