To add a study while in the chart select your properties which are the three dots located in the upper right. Select add a study and you will be directed to the list of studies. You have two options for picking your studies first you can type in the search to find your study, or you can tap on the category heading to pick your study.

To remove a study while in the chart select your properties which are the three dots located in the upper right. Select remove a study and you will be directed to the list of studies that are available on your chart to be removed.