For an activity to report on an indicator in DevResults, the indicator must be assigned to that activity.
First, go to the Activities tab of the main menu, select your activity, and the go to that activity's Overview tab.
Scroll down to the "Classification" section and click on "Select results and indicators".
On the popup window that appears, expand the results framework(s) by clicking on the right-pointing triangles.
You can assign all of the indicators under a part of the results framework by clicking on the checkbox next to that technical area, such as 2.3 Teacher Training, shown in orange.
You can also assign single indicators by only clicking on the checkboxes for those particular indicators, leaving the others clear.
All of the checked indicators are now assigned to this activity.