Most courses in the Plan are listed specifically, so that when you take them, they show up in green and On Track. There are also placeholders and choice blocks that, until an actual course is designated, they will not show as fulfilled and On Track in your Plan.
When a decision is made regarding the choice requirements or placeholders, you can drag the actual course from the Still Needed column to the appropriate term.

Courses listed under the Still Needed column can be used to take the place of the placeholder. Placeholder blocks are indicated by the shade of yellow at the top of the block. Placeholders also contain descriptive language but do not count towards the number of total term credits until a specific course is selected. To select a course to replace the placeholder, simply drag and drop from the Still Needed column to the appropriate term.

Choice blocks contain several options that are available to the student. Once a decision is made regarding which course will be taken, you can click Edit by clicking on the three dots in the upper right-hand corner.

Click Edit this requirement. 
Choose which course will be taken by selecting the appropriate radio button. Then click Save.

Choosing a specific course from the choice blocks and inserting a specific course to replace the placeholder will result in showing the requirement as fulfilled and On Track.
