In order to calculate earned value you must have the following:

1. Tasks with costed resources assigned.
2. A baseline saved.
3. Progress recorded.

How did you enter costs? Through Fixed Costs?

Have you saved a baseline?

You should be able to view the Earned Value table applied to the Task Usage view or the regular Gantt chart view. Earned value is calculated as of the status date. So, you set your status date, update your tasks and Earned Value data is calculated for you.

You should also be able to add the Earned value table to the timescaled portion.