Only HR can add a job description. Go to "HR Dashboard" > "People" > select the employee > go to their profile > click on "Job Title" > under "Job Description" click on "+ Add". Select the date and click on the "Load default job description" button. The job description fields will be automatically filled with the default job description that is stored in (if one has been created). Default job descriptions are managed in "Administration" > "People" > "Job Titles".
