Click on the "Create a new Activity" button. Choose a name, define a default duration for this activity (could be modified later), choose a background color and a background over color if you want (copy and paste the color inside the over color cell will select this color automatically. This way it's easy to define a variant over color based on the background color). Do the same for the font color and the font over color (default is white for both). To insert additional information to the activity (links, description, image and info fields) you have to go to the activity edit screen. Click here to learn how to manage activities.
Click on "OK" to save
The new activity is inserted in the left white area.
Click on its name and hold to drag it to a column.
You can override the default duration you entered when you created the activity. Change the duration and drag it again to a column with the new duration.
Cell's height is adjusted according to the duration (height is approximative in the admin area and very precise in the front-end display).
Click here to learn how to load existing activities