To manage the Symptoms, Exertion, and Other factors you track and score during your Evening Check-in, go to Profile > Trackers.
In Symptoms, you can choose from a list of pre-defined symptoms. You can also add a custom symptom. After adding a custom symptom, click Done, and it will save. You can then access and score it during your Evening Check-in and track it on the Trends tab.
In Exertion you can choose the different types of exertion you wish to track such as Cognitive or Social Exertion. You cannot add a custom Exertion.
In Other factors, you can choose whether to track Periods, Crashes, and Infections. This is where you'll also be able to add your medications. After adding a medication, click Done, and it will save, allowing you to track whether you have taken this medication during your Evening Check-in and to track this in your Trends tab.