SimpleClinic uses a main menu on the left side of the screen (after you login!) to separate the major features of the program.
Within each menu option there may be lower menu levels, such as in the Patients screen.
From the patient information page, there's another level of menu options for that selected patient. Selecting each option will display further information for that patient, such as their treatment notes, prescriptions and invoices. To return to the selected patient's details again, click on the patient's name link from the lower level page.
Clicking on the "Back" button from your internet browser may have differing results, depending on which browser you use!