If your chosen program has a concentration (or specialization/track) you can add or remove these to your plan in Stellic.
It's important to remember that changes made in the Stellic platform will not update your official status with your institution. To officially declare a concentration, go through your normal school's channels. Those changes will populate to Stellic automatically.
In your Track Progress view, you'll be able to see which concentrations (if any) are already selected for your plan by the 'Declared' tag on the Concentration name. Any Concentrations that are not in your plan will have a tag that says "Not in Plan".
To add a concentration within Stellic, first click on the arrow next to requirement that houses all of the concentrations in order to expand that category and see all the possible concentrations. Additional concentration options will fill in underneath your current concentration, if one is already selected, so you may need to scroll down for the full list.
Then you can click the three dots next to your chosen concentration and click 'Add Concentration'.
You can also remove concentrations by clicking the three dots next to a selected concentration and clicking 'Remove Concentration'.