If you decide to add a second major, aka, "dual-major" (in other words, add another program of study to your current one), there will be some classes that you will need to add to your current program of study (or "major"). You will need to discuss this plan with your advisor - and gain their approval before adding an additional program. There will be some additional elements that you will need to complete. Please refer to THIS PAGE in the students' section of our website.
You will need to complete the form linked above and submit it to your advisor for processing.